Re: [XeTeX] cmyk encoded files
Thank you Peter for the XDV analysis. Thank you Andy Lin for the Eslite suggestion. Thank you Zdenek Wagner for the excellent links. And thank you William Adams for the gimp information. All of it is very helpful to me, and I appreciate all the information very much. On Monday at one of the schools I work at, I saw an upcropped calendar. In the to-be-cropped margins there were maybe a hundred or so color swatches with CMYK written nearby. I may be able to go to the print house that printed that and get some useful color samples as well. Thank you again, Dan On Mon, Nov 21, 2011 at 9:35 PM, William Adams wrote: > I wrote: > >> note that most printers mix their spot colour inks according to Pantone's >> formula guides and the colour accuracy will depend not only on how the press >> is operated and the ink interacts w/ the paper. > > Sorry, got cut off. > > append that w/ ``and how accurately the ink has been mixed''. > > (and should probably replace ``most'' w/ ``many'' and note that this varies > w/ geography) > > William > > -- > William Adams > senior graphic designer > Fry Communications > Sphinx of black quartz, judge my vow. > > > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
I wrote: > note that most printers mix their spot colour inks according to Pantone's > formula guides and the colour accuracy will depend not only on how the press > is operated and the ink interacts w/ the paper. Sorry, got cut off. append that w/ ``and how accurately the ink has been mixed''. (and should probably replace ``most'' w/ ``many'' and note that this varies w/ geography) William -- William Adams senior graphic designer Fry Communications Sphinx of black quartz, judge my vow. -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
On Nov 20, 2011, at 6:56 PM, Zdenek Wagner wrote: > This information is a bit misleading. As I wrote, Pantone are custom > colours that cannot be printed with CMYK, they can only be > approximated. Such swatches are useful if you have to approximate a > Pantone colour with CMYK. It sometimes happens. No, Pantone is a company which sells color systems and inks. They have a line of spot colors (identified by numbers and/or names) _some_ of which are outside of the CMYK gamut (but many are w/in Hexachrome gamut). They also market materials which identify which CMYK builds can be used to approximate which Pantone Spot Colors --- note that most printers mix their spot colour inks according to Pantone's formula guides and the colour accuracy will depend not only on how the press is operated and the ink interacts w/ the paper. If one needs to do Spot Colors in XeTeX, that's a bit of a problem, since making a named ink / plate isn't easily done in XeTeX (this can be done in pdftex using ConTeXt, or if need be w/ raw PostScript and presumably PostScript specials) --- but that's not the CMYK printing from the Subject line. William -- William Adams senior graphic designer Fry Communications Sphinx of black quartz, judge my vow. -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
2011/11/21 William Adams : > On Nov 19, 2011, at 8:51 PM, Daniel Greenhoe wrote: > >> 2011/11/20 Zdenek Wagner : >>> Printed colour samples are commercially available. >>> They are printed on different types of papers and CMYK values are given. >> >> Is there any such thing available in book form? That is, could you >> make a recommendation? Here in Taiwan, there is something commonly >> sold called Pantone彩色聖經 (Pantone Cai3Se4 Sheng4Jing1 = Pantone Color >> Bible). I did finally locate one in a bookstore yesterday, but it was >> sealed up and I wasn't allowed to open it without buying it. > > Yes, there are / have been such books in the past / may still be available > for purchase now. > > Some really good books on this: > > http://www.abebooks.com/Four-ColorsOne-Image-Nyman-Mattias-Peachpit/5731781020/bd > > http://www.amazon.com/Process-Manual-Combinations-Prepress-Printing/dp/0811827577 > > http://www.amazon.com/Duotones-Tritones-Quadtones-Enhancing-Four-Color/dp/0811814262 > > The Pantone Color Bible may be just spot colours, in which case it won't be > as useful. > > Far more useful is to simply understand the underlying principles of > subtractive color and how printing plates are manufactured and to work with > your printer to achieve the desired effects in a way which is suited to their > equipment. > > http://www.worqx.com/color/color_systems.htm > This is a good link and it shows also the gamut. Maybe it's written there but for completness I would add that the Pantone colours are mostly outside the CMYK gamut. Demonstration of additive and subtractive mixing can be shown easily in gimp, I am attaching sample files that I created years ago for my lecture. You can go from one to another just by changing the layer mode and the colour of the background layer. > William > > -- > William Adams > senior graphic designer > Fry Communications > Sphinx of black quartz, judge my vow. > > > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Zdeněk Wagner http://hroch486.icpf.cas.cz/wagner/ http://icebearsoft.euweb.cz subtractive.xcf.bz2 Description: BZip2 compressed data additive.xcf.bz2 Description: BZip2 compressed data -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
On Nov 19, 2011, at 8:51 PM, Daniel Greenhoe wrote: > 2011/11/20 Zdenek Wagner : >> Printed colour samples are commercially available. >> They are printed on different types of papers and CMYK values are given. > > Is there any such thing available in book form? That is, could you > make a recommendation? Here in Taiwan, there is something commonly > sold called Pantone彩色聖經 (Pantone Cai3Se4 Sheng4Jing1 = Pantone Color > Bible). I did finally locate one in a bookstore yesterday, but it was > sealed up and I wasn't allowed to open it without buying it. Yes, there are / have been such books in the past / may still be available for purchase now. Some really good books on this: http://www.abebooks.com/Four-ColorsOne-Image-Nyman-Mattias-Peachpit/5731781020/bd http://www.amazon.com/Process-Manual-Combinations-Prepress-Printing/dp/0811827577 http://www.amazon.com/Duotones-Tritones-Quadtones-Enhancing-Four-Color/dp/0811814262 The Pantone Color Bible may be just spot colours, in which case it won't be as useful. Far more useful is to simply understand the underlying principles of subtractive color and how printing plates are manufactured and to work with your printer to achieve the desired effects in a way which is suited to their equipment. http://www.worqx.com/color/color_systems.htm William -- William Adams senior graphic designer Fry Communications Sphinx of black quartz, judge my vow. -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
2011/11/20 Daniel Greenhoe : > Thank you for the color information. It just seems that there should > be a color printing standard that print houses strive to follow and > that someone would produce a booklet based on that standard. > > I saw this in a document from one print house: > > "Consumer quality printers have a wide margin for variation. The best > way to verify the final color output, when submitting a file to a > printer, is to purchase a Pantone to Process Swatch booklet from a > local professional art supply shop. This book contains Pantone > calibrated color swatches that you can compare to the CMYK color > percentages of your digital file" > > But if there is no "professional art supply shop" around, where does > one find such a booklet? > This information is a bit misleading. As I wrote, Pantone are custom colours that cannot be printed with CMYK, they can only be approximated. Such swatches are useful if you have to approximate a Pantone colour with CMYK. It sometimes happens. However, colour printing is a bit science and a bit art. What you see is light reflected by the printed page. The light is reflected by the paper and some wavelengths are subtracted (absorbed) by the inks. What remains is perceived by your eye and your brain perceives it as some colour (colour is not a physical property, it exists only in our brains). If I neglect subjective perception by our eyes and brains, the colour is determined by the printed ink, by the paper and even by the light. It makes little sense to search for CMYK percentages before you select a paper. It happened to me just a few months ago. I had to typeset a poetry book for children with a lot of colour pictures. The publisher did not ask my advice and selected a paper with a beautiful structure that would be very nice for a poetry book but absolutely unsuitable for colour pictures. Fortunatelly they printed just one sample book that had to be thrown to a trash. In offset printing the inks are not applied all at the same time but sequentially. Thus the printed page consists of layers. The order influences the resulting colour. Thus if you buy swatches, you should know the paper used, the order of colour printing, the ICC profile used (this corresponds to the ink types). For instance, in European print houses different CMYK inks are used in comparison to USA but even in Europe some printer houses may use US inks. This is important to know before you convert colours to CMYK. Some print houses offer ICC profiles for their devices for free. And of course, when looking at the swatches, you have to use a standard light. Standard bulbs can be bought in art shops. Good print houses have them installed in customer rooms so that a customer can see a printed sample properly. Some print houses are reliable and you know that they will always print the same document in the same way with the same colours, some are unreliable. In good print houses you can always ask for printing a sample, in the really good ones they even do it for free. There are also companies that can produce a custom CMYK ICC profile. You have to print a standard sample on the same device and the same paper and they will measure it by a spectrometer and give you an ICC file. It may cost some 50 $ but if you produce an expensive book, it is worth that money. I do not use custom CMYK profiles. First I calibrated my flatbed scanner using an IT8 target supplied with the scanner. Then I calibrated my inkjet by printing IT8 and measuring it by the calibrated scanner. All this can be done by VueScan (www.hamrick.com). My screen is not calibrated but I can compare a color table on screen with the same table printed on my calibrated inkjet. Now when I take a photo with my digital camera and have it printed in a photolab, I get exactly the same colour as on my screen. I played a bit in order to find an ICC profile that I could plug into LCMS for conversion to CMYK. Now when I have a document prited by offest or by a digital machine, I get the same colour as on my screen. Thus I have a standard production chain: scanner - screen - inkjet - offset - digital printer. And where to buy all the things? I found an internet shop in our country that sells swatches, standard bulbs, textbooks, software and a lot of other useful things. You may find one in your country. > > On Sun, Nov 20, 2011 at 10:34 PM, Zdenek Wagner > wrote: >> 2011/11/20 Daniel Greenhoe : >>> 2011/11/20 Zdenek Wagner : Printed colour samples are commercially available. They are printed on different types of papers and CMYK values are given. >>> >>> Is there any such thing available in book form? That is, could you >>> make a recommendation? Here in Taiwan, there is something commonly >>> sold called Pantone彩色聖經 (Pantone Cai3Se4 Sheng4Jing1 = Pantone Color >>> Bible). I did finally locate one in a bookstore yesterday, but it was >>> sealed up and I wasn't allowed to open it without buying it. >>> >> Hard to say but Pantone is no
Re: [XeTeX] cmyk encoded files
If your local Eslite doesn't have such a booklet, and they can't order one, you might want to try asking around at small print shops. They're actually fairly substantial and are along the same lines as the Pantone book that you found. However, if you're at a print shop anyway, you can just ask to see their sample book, which should show the stocks and inks and treatments that they have available. Colour printing in Asia is significantly cheaper than elsewhere in the world. You may find it easier to just request a proof before you commit to a larger order. Or, failing that, compile a swatch card composed of all the colours that are in your document and ask them to print that. Between process (cmyk) or Pantone, just remember that Pantone colours are much more expensive, but they do offer a wide range of possible colours. HTH, Andy -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
Thank you for the color information. It just seems that there should be a color printing standard that print houses strive to follow and that someone would produce a booklet based on that standard. I saw this in a document from one print house: "Consumer quality printers have a wide margin for variation. The best way to verify the final color output, when submitting a file to a printer, is to purchase a Pantone to Process Swatch booklet from a local professional art supply shop. This book contains Pantone calibrated color swatches that you can compare to the CMYK color percentages of your digital file" But if there is no "professional art supply shop" around, where does one find such a booklet? On Sun, Nov 20, 2011 at 10:34 PM, Zdenek Wagner wrote: > 2011/11/20 Daniel Greenhoe : >> 2011/11/20 Zdenek Wagner : >>> Printed colour samples are commercially available. >>> They are printed on different types of papers and CMYK values are given. >> >> Is there any such thing available in book form? That is, could you >> make a recommendation? Here in Taiwan, there is something commonly >> sold called Pantone彩色聖經 (Pantone Cai3Se4 Sheng4Jing1 = Pantone Color >> Bible). I did finally locate one in a bookstore yesterday, but it was >> sealed up and I wasn't allowed to open it without buying it. >> > Hard to say but Pantone is not exactly what you need. I bouhgt some > small samples here in the Czech Republic, this is a link: > http://www.dtpstudio.cz/vzorniky/cmyk/basic > Using CMYK just limited colours can be printed. The colours are > obtained by subtractive mixing, therefore saturated colours cannot be > printed. You can only print colours that fall into the CMYK gamut. If > you do not print in full colour but need only one, two or three > colours, custom colours can be used. This is the time when you can use > Pantone. Often company logos are designed using custom colours. You > can also find CMYK approximations of custom colours, it may be in the > Pantone Bible. When using a custom colour, it need not be necessarily > 100%, for instance the cover if this book was printed with the > following three colours: Blue GS 4C12, Red GS 3C41, Black. This is the > link to the book: > http://www.canopus.cz/dilo_ps/ps.html > > Hope it helps > >> Dan >> >> >> >> 2011/11/20 Zdenek Wagner : >>> 2011/11/20 Daniel Greenhoe : 2011/11/20 Zdenek Wagner : > No. > LCMS is a good choice. LCMS is "Little Color Management System"? (http://www.color.org/opensource.xalter)? >>> Yes. >>> > 1. It ensures that the colours you specify in the document will be > converted to cmyk. > However, the corrections are wrong. > 2. xcolor does not look into inserted graphics,... But what if I hand define all my colors using cmyk syntax like this for example \definecolor{magenta}{cmyk}{0,1,0,0} and create all my graphics using pstricks and related packages (with no inserted graphics)? Then won't the resulting pdf be cmyk compliant and contain exactly the colors I defined? >>> That's what I do. Printed colour samples are commercially available. >>> They are printed on different types of papers and CMYK values are >>> given. Thus you select the required colour on a proper paper and use >>> it. Sometimes I select the colour in gimp and then using LCMS convert >>> the values from RGB to CMYK. Scanned images are also easy. I keep them >>> as TIF, using LCMS convert them to CMYK and then by tiff2pdf to PDF >>> that can be included by \includegraphics. >>> Dan 2011/11/20 Zdenek Wagner : > 2011/11/19 Daniel Greenhoe : >> Print shops often require pdf files containing color to be encoded >> using CMYK colorspace values. >> >> Version 2.11 of the xcolor package says that cmyk is "supported by >> Postscripts directly" (page 8). So if I simply specify >> \usepackage[cmyk]{xcolor} >> in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to >> ensure the resulting pdf is cmyk encoded? >> > No. > > 1. It ensures that the colours you specify in the document will be > converted to cmyk. However, the corrections are wrong. If you wish to > convert the colours properly, you have to use colour profiles. LCMS is > a good choice. Useful ICC profiles come with different products as > Adobe Reader, colour printers, scanners etc. They can also be > downloaded from the web. Calculations in the xcolor package can only > be used if you are satisfied with approximate colours. It is written > in the documentation that conversions are device dependent. > > 2. xcolor does not look into inserted graphics, you have to convert > your images to cmyk separately. Again LCMS is a good tool for this > purpose. > >> Secondly, is there any free utility available for checking the >> colorspace encoding of pdf files (maybe similar to foolab's pd
Re: [XeTeX] cmyk encoded files
2011/11/20 Daniel Greenhoe : > 2011/11/20 Zdenek Wagner : >> Printed colour samples are commercially available. >> They are printed on different types of papers and CMYK values are given. > > Is there any such thing available in book form? That is, could you > make a recommendation? Here in Taiwan, there is something commonly > sold called Pantone彩色聖經 (Pantone Cai3Se4 Sheng4Jing1 = Pantone Color > Bible). I did finally locate one in a bookstore yesterday, but it was > sealed up and I wasn't allowed to open it without buying it. > Hard to say but Pantone is not exactly what you need. I bouhgt some small samples here in the Czech Republic, this is a link: http://www.dtpstudio.cz/vzorniky/cmyk/basic Using CMYK just limited colours can be printed. The colours are obtained by subtractive mixing, therefore saturated colours cannot be printed. You can only print colours that fall into the CMYK gamut. If you do not print in full colour but need only one, two or three colours, custom colours can be used. This is the time when you can use Pantone. Often company logos are designed using custom colours. You can also find CMYK approximations of custom colours, it may be in the Pantone Bible. When using a custom colour, it need not be necessarily 100%, for instance the cover if this book was printed with the following three colours: Blue GS 4C12, Red GS 3C41, Black. This is the link to the book: http://www.canopus.cz/dilo_ps/ps.html Hope it helps > Dan > > > > 2011/11/20 Zdenek Wagner : >> 2011/11/20 Daniel Greenhoe : >>> 2011/11/20 Zdenek Wagner : No. >>> LCMS is a good choice. >>> LCMS is "Little Color Management System"? >>> (http://www.color.org/opensource.xalter)? >>> >> Yes. >> 1. It ensures that the colours you specify in the document will be converted to cmyk. However, the corrections are wrong. 2. xcolor does not look into inserted graphics,... >>> >>> But what if I hand define all my colors using cmyk syntax like this for >>> example >>> \definecolor{magenta}{cmyk}{0,1,0,0} >>> and create all my graphics using pstricks and related packages (with >>> no inserted graphics)? >>> Then won't the resulting pdf be cmyk compliant and contain exactly the >>> colors I defined? >>> >> That's what I do. Printed colour samples are commercially available. >> They are printed on different types of papers and CMYK values are >> given. Thus you select the required colour on a proper paper and use >> it. Sometimes I select the colour in gimp and then using LCMS convert >> the values from RGB to CMYK. Scanned images are also easy. I keep them >> as TIF, using LCMS convert them to CMYK and then by tiff2pdf to PDF >> that can be included by \includegraphics. >> >>> Dan >>> >>> >>> >>> >>> 2011/11/20 Zdenek Wagner : 2011/11/19 Daniel Greenhoe : > Print shops often require pdf files containing color to be encoded > using CMYK colorspace values. > > Version 2.11 of the xcolor package says that cmyk is "supported by > Postscripts directly" (page 8). So if I simply specify > \usepackage[cmyk]{xcolor} > in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to > ensure the resulting pdf is cmyk encoded? > No. 1. It ensures that the colours you specify in the document will be converted to cmyk. However, the corrections are wrong. If you wish to convert the colours properly, you have to use colour profiles. LCMS is a good choice. Useful ICC profiles come with different products as Adobe Reader, colour printers, scanners etc. They can also be downloaded from the web. Calculations in the xcolor package can only be used if you are satisfied with approximate colours. It is written in the documentation that conversions are device dependent. 2. xcolor does not look into inserted graphics, you have to convert your images to cmyk separately. Again LCMS is a good tool for this purpose. > Secondly, is there any free utility available for checking the > colorspace encoding of pdf files (maybe similar to foolab's pdffonts > for checking embedded fonts). > I have not found any. Since I produce PDF files for printing very often, I calculated that commercial Adobe Acrobat is cheaper than the risk of paying unusable books, thus I have bought it. > Many thanks in advance, > Dan > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Zdeněk Wagner http://hroch486.icpf.cas.cz/wagner/ http://icebearsoft.euweb.cz -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex >>> >>> >>> >>> -- >>> Subscriptions, Archive, and List inform
Re: [XeTeX] cmyk encoded files
2011/11/20 Zdenek Wagner : > Printed colour samples are commercially available. > They are printed on different types of papers and CMYK values are given. Is there any such thing available in book form? That is, could you make a recommendation? Here in Taiwan, there is something commonly sold called Pantone彩色聖經 (Pantone Cai3Se4 Sheng4Jing1 = Pantone Color Bible). I did finally locate one in a bookstore yesterday, but it was sealed up and I wasn't allowed to open it without buying it. Dan 2011/11/20 Zdenek Wagner : > 2011/11/20 Daniel Greenhoe : >> 2011/11/20 Zdenek Wagner : >>> No. >> >>> LCMS is a good choice. >> LCMS is "Little Color Management System"? >> (http://www.color.org/opensource.xalter)? >> > Yes. > >>> 1. It ensures that the colours you specify in the document will be >>> converted to cmyk. >>> However, the corrections are wrong. >>> 2. xcolor does not look into inserted graphics,... >> >> But what if I hand define all my colors using cmyk syntax like this for >> example >> \definecolor{magenta}{cmyk}{0,1,0,0} >> and create all my graphics using pstricks and related packages (with >> no inserted graphics)? >> Then won't the resulting pdf be cmyk compliant and contain exactly the >> colors I defined? >> > That's what I do. Printed colour samples are commercially available. > They are printed on different types of papers and CMYK values are > given. Thus you select the required colour on a proper paper and use > it. Sometimes I select the colour in gimp and then using LCMS convert > the values from RGB to CMYK. Scanned images are also easy. I keep them > as TIF, using LCMS convert them to CMYK and then by tiff2pdf to PDF > that can be included by \includegraphics. > >> Dan >> >> >> >> >> 2011/11/20 Zdenek Wagner : >>> 2011/11/19 Daniel Greenhoe : Print shops often require pdf files containing color to be encoded using CMYK colorspace values. Version 2.11 of the xcolor package says that cmyk is "supported by Postscripts directly" (page 8). So if I simply specify \usepackage[cmyk]{xcolor} in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to ensure the resulting pdf is cmyk encoded? >>> No. >>> >>> 1. It ensures that the colours you specify in the document will be >>> converted to cmyk. However, the corrections are wrong. If you wish to >>> convert the colours properly, you have to use colour profiles. LCMS is >>> a good choice. Useful ICC profiles come with different products as >>> Adobe Reader, colour printers, scanners etc. They can also be >>> downloaded from the web. Calculations in the xcolor package can only >>> be used if you are satisfied with approximate colours. It is written >>> in the documentation that conversions are device dependent. >>> >>> 2. xcolor does not look into inserted graphics, you have to convert >>> your images to cmyk separately. Again LCMS is a good tool for this >>> purpose. >>> Secondly, is there any free utility available for checking the colorspace encoding of pdf files (maybe similar to foolab's pdffonts for checking embedded fonts). >>> I have not found any. Since I produce PDF files for printing very >>> often, I calculated that commercial Adobe Acrobat is cheaper than the >>> risk of paying unusable books, thus I have bought it. >>> Many thanks in advance, Dan -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex >>> >>> >>> >>> -- >>> Zdeněk Wagner >>> http://hroch486.icpf.cas.cz/wagner/ >>> http://icebearsoft.euweb.cz >>> >>> >>> >>> -- >>> Subscriptions, Archive, and List information, etc.: >>> http://tug.org/mailman/listinfo/xetex >>> >> >> >> >> -- >> Subscriptions, Archive, and List information, etc.: >> http://tug.org/mailman/listinfo/xetex >> > > > > -- > Zdeněk Wagner > http://hroch486.icpf.cas.cz/wagner/ > http://icebearsoft.euweb.cz > > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
2011/11/20 Daniel Greenhoe : > 2011/11/20 Zdenek Wagner : >> No. > >> LCMS is a good choice. > LCMS is "Little Color Management System"? > (http://www.color.org/opensource.xalter)? > Yes. >> 1. It ensures that the colours you specify in the document will be converted >> to cmyk. >> However, the corrections are wrong. >> 2. xcolor does not look into inserted graphics,... > > But what if I hand define all my colors using cmyk syntax like this for > example > \definecolor{magenta}{cmyk}{0,1,0,0} > and create all my graphics using pstricks and related packages (with > no inserted graphics)? > Then won't the resulting pdf be cmyk compliant and contain exactly the > colors I defined? > That's what I do. Printed colour samples are commercially available. They are printed on different types of papers and CMYK values are given. Thus you select the required colour on a proper paper and use it. Sometimes I select the colour in gimp and then using LCMS convert the values from RGB to CMYK. Scanned images are also easy. I keep them as TIF, using LCMS convert them to CMYK and then by tiff2pdf to PDF that can be included by \includegraphics. > Dan > > > > > 2011/11/20 Zdenek Wagner : >> 2011/11/19 Daniel Greenhoe : >>> Print shops often require pdf files containing color to be encoded >>> using CMYK colorspace values. >>> >>> Version 2.11 of the xcolor package says that cmyk is "supported by >>> Postscripts directly" (page 8). So if I simply specify >>> \usepackage[cmyk]{xcolor} >>> in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to >>> ensure the resulting pdf is cmyk encoded? >>> >> No. >> >> 1. It ensures that the colours you specify in the document will be >> converted to cmyk. However, the corrections are wrong. If you wish to >> convert the colours properly, you have to use colour profiles. LCMS is >> a good choice. Useful ICC profiles come with different products as >> Adobe Reader, colour printers, scanners etc. They can also be >> downloaded from the web. Calculations in the xcolor package can only >> be used if you are satisfied with approximate colours. It is written >> in the documentation that conversions are device dependent. >> >> 2. xcolor does not look into inserted graphics, you have to convert >> your images to cmyk separately. Again LCMS is a good tool for this >> purpose. >> >>> Secondly, is there any free utility available for checking the >>> colorspace encoding of pdf files (maybe similar to foolab's pdffonts >>> for checking embedded fonts). >>> >> I have not found any. Since I produce PDF files for printing very >> often, I calculated that commercial Adobe Acrobat is cheaper than the >> risk of paying unusable books, thus I have bought it. >> >>> Many thanks in advance, >>> Dan >>> >>> >>> -- >>> Subscriptions, Archive, and List information, etc.: >>> http://tug.org/mailman/listinfo/xetex >>> >> >> >> >> -- >> Zdeněk Wagner >> http://hroch486.icpf.cas.cz/wagner/ >> http://icebearsoft.euweb.cz >> >> >> >> -- >> Subscriptions, Archive, and List information, etc.: >> http://tug.org/mailman/listinfo/xetex >> > > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Zdeněk Wagner http://hroch486.icpf.cas.cz/wagner/ http://icebearsoft.euweb.cz -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
2011/11/20 Zdenek Wagner : > No. > LCMS is a good choice. LCMS is "Little Color Management System"? (http://www.color.org/opensource.xalter)? > 1. It ensures that the colours you specify in the document will be converted > to cmyk. > However, the corrections are wrong. > 2. xcolor does not look into inserted graphics,... But what if I hand define all my colors using cmyk syntax like this for example \definecolor{magenta}{cmyk}{0,1,0,0} and create all my graphics using pstricks and related packages (with no inserted graphics)? Then won't the resulting pdf be cmyk compliant and contain exactly the colors I defined? Dan 2011/11/20 Zdenek Wagner : > 2011/11/19 Daniel Greenhoe : >> Print shops often require pdf files containing color to be encoded >> using CMYK colorspace values. >> >> Version 2.11 of the xcolor package says that cmyk is "supported by >> Postscripts directly" (page 8). So if I simply specify >> \usepackage[cmyk]{xcolor} >> in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to >> ensure the resulting pdf is cmyk encoded? >> > No. > > 1. It ensures that the colours you specify in the document will be > converted to cmyk. However, the corrections are wrong. If you wish to > convert the colours properly, you have to use colour profiles. LCMS is > a good choice. Useful ICC profiles come with different products as > Adobe Reader, colour printers, scanners etc. They can also be > downloaded from the web. Calculations in the xcolor package can only > be used if you are satisfied with approximate colours. It is written > in the documentation that conversions are device dependent. > > 2. xcolor does not look into inserted graphics, you have to convert > your images to cmyk separately. Again LCMS is a good tool for this > purpose. > >> Secondly, is there any free utility available for checking the >> colorspace encoding of pdf files (maybe similar to foolab's pdffonts >> for checking embedded fonts). >> > I have not found any. Since I produce PDF files for printing very > often, I calculated that commercial Adobe Acrobat is cheaper than the > risk of paying unusable books, thus I have bought it. > >> Many thanks in advance, >> Dan >> >> >> -- >> Subscriptions, Archive, and List information, etc.: >> http://tug.org/mailman/listinfo/xetex >> > > > > -- > Zdeněk Wagner > http://hroch486.icpf.cas.cz/wagner/ > http://icebearsoft.euweb.cz > > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
On Sun, Nov 20, 2011 at 7:34 AM, Peter Dyballa wrote: > It seems so! > XeTeX/XeLaTeX can be invoked with --no-pdf. > The created XDV file gives hints that CMYK is used (color push cmyk <4 > values>). That is good news. And that was a clever method for checking. I did not think of trying that myself. Thank you! Dan On Sun, Nov 20, 2011 at 7:34 AM, Peter Dyballa wrote: > > Am 19.11.2011 um 23:03 schrieb Daniel Greenhoe: > >> Version 2.11 of the xcolor package says that cmyk is "supported by >> Postscripts directly" (page 8). So if I simply specify >> \usepackage[cmyk]{xcolor} >> in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to >> ensure the resulting pdf is cmyk encoded? > > It seems so! XeTeX/XeLaTeX can be invoked with --no-pdf. The created XDV file > gives hints that CMYK is used (color push cmyk <4 values>). Pdftops from the > xpdf suite produces a PS file which also gives hints that colour is used in > the CMYK model. Mac OS X's sips tells it uses RGB model... > > -- > Greetings > > Pete > > This is a signature virus. Add me to your signature and help me to live! > > > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
2011/11/19 Daniel Greenhoe : > Print shops often require pdf files containing color to be encoded > using CMYK colorspace values. > > Version 2.11 of the xcolor package says that cmyk is "supported by > Postscripts directly" (page 8). So if I simply specify > \usepackage[cmyk]{xcolor} > in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to > ensure the resulting pdf is cmyk encoded? > No. 1. It ensures that the colours you specify in the document will be converted to cmyk. However, the corrections are wrong. If you wish to convert the colours properly, you have to use colour profiles. LCMS is a good choice. Useful ICC profiles come with different products as Adobe Reader, colour printers, scanners etc. They can also be downloaded from the web. Calculations in the xcolor package can only be used if you are satisfied with approximate colours. It is written in the documentation that conversions are device dependent. 2. xcolor does not look into inserted graphics, you have to convert your images to cmyk separately. Again LCMS is a good tool for this purpose. > Secondly, is there any free utility available for checking the > colorspace encoding of pdf files (maybe similar to foolab's pdffonts > for checking embedded fonts). > I have not found any. Since I produce PDF files for printing very often, I calculated that commercial Adobe Acrobat is cheaper than the risk of paying unusable books, thus I have bought it. > Many thanks in advance, > Dan > > > -- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -- Zdeněk Wagner http://hroch486.icpf.cas.cz/wagner/ http://icebearsoft.euweb.cz -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
Re: [XeTeX] cmyk encoded files
Am 19.11.2011 um 23:03 schrieb Daniel Greenhoe: > Version 2.11 of the xcolor package says that cmyk is "supported by > Postscripts directly" (page 8). So if I simply specify > \usepackage[cmyk]{xcolor} > in the preamble and compile with XeTeX/XeLaTeX, is that sufficient to > ensure the resulting pdf is cmyk encoded? It seems so! XeTeX/XeLaTeX can be invoked with --no-pdf. The created XDV file gives hints that CMYK is used (color push cmyk <4 values>). Pdftops from the xpdf suite produces a PS file which also gives hints that colour is used in the CMYK model. Mac OS X's sips tells it uses RGB model... -- Greetings Pete This is a signature virus. Add me to your signature and help me to live! -- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex