Re: [NTG-context] Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
Am 14.11.18 um 16:04 schrieb Peter Rolf: > Mh, the file size of "ISOcoated_v2_300_eci.icc" is around 1.7MB. I > highly doubt that ConTeXt can compress it into a 10KB PDF. > > But I'm not so sure if PDF/X-3 needs embedding (there was an exception). > Never used it (only PDF/X-4p) and I can't remember the specifications > (all those stuff was added over 8 years ago). > > I just assume you have installed the icc profiles properly (needs a > manual installation!) :D There are some profiles in the context installation. At least something was found: backend > profiles > profile specification 'ISOcoated_v2_300_eci.icc' loaded from '/home/juh/context/tex/texmf-context/colors/icc/context/colorprofiles.xml' backend > profiles > omitting reference to profile for intent 'ISO Coated v2 300% (ECI)' But, yes the size is too small to have the whole profile incorporated. juh ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
Am 2018-11-14 um 15:36 schrieb Jan U. Hasecke: > Thanks a lot, Peter. > > Am 14.11.18 um 14:58 schrieb Peter Rolf: >> Hi Jan, >> >> I donno if things have changed (ConTeXt is a fast moving target), so >> take my answers with a grain of salt. >> >> (1) >> AFAIK there is no ACTIVE color management in ConTeXt in the sense that >> there is an automatic color conversion from one profiled(!) colorspace >> into another profiled color space. This means that all given colors >> (objects) have to be in the correct (profiled) color space already! >> >> Objects with embedded color profiles (e.g. a PDF bitmap graphic with icc >> profile) will use those. Objects without a profile will use the >> corresponding "default" color space profiles. These default color space >> profiles can be defined via "profile" in \setupbackend. >> This way every color in the PDF is defined properly. > > This would clarify some of the issues. > > When I define rgb colors AND use not-print-modus I get the right rgb > colors in the pdf. > > When I define cmyk colors AND use print modus I get colors that might be > correct (tested next week) > > But obviously it is not possible to define both color spaces in > \definecolor because I don't get the same colors in the pdf as with the > cmyk-only defined file. > > Maybe I misunderstood this, I've got a hint here, that I could define > rgb and cmyk in the same \definecolor and choose the right color space > in \setupcolors. > > The correct method of defining rgb AND cmyk in the same file would be to > put the definecolor command inside a startstopmode-environment. > > Can someone confirm this? > Should work (the other part is invisible for ConTeXt). >> >> (2) >> >> I think so. Can't test, because my Windows 10 is beyond repair after >> three "upgrades" and Acrobat is not working properly anymore. >> >> (3) >> >> Judging from the size of the final PDF, the icc profile is not embedded. >> The profiles have to be installed in "the right place" (this includes >> ConTeXt but also the PDF viewer software). >> >> See "ICC profiles" section at >> >> https://wiki.contextgarden.net/PDFX >> > > With --mode=print (which uses the color profiles) the pdf get bigger. >> 10.000 compared to 8.000 without the mode. So I would guess that they > are included. > Mh, the file size of "ISOcoated_v2_300_eci.icc" is around 1.7MB. I highly doubt that ConTeXt can compress it into a 10KB PDF. But I'm not so sure if PDF/X-3 needs embedding (there was an exception). Never used it (only PDF/X-4p) and I can't remember the specifications (all those stuff was added over 8 years ago). I just assume you have installed the icc profiles properly (needs a manual installation!) :D > I hope I get this sorted out, because I want to print a series of > folders and other print products with ConTeXt in the near future. > > juh > >> (5) see (1) and (3) >> >> >> >> Hope this helps, >> >> >> Peter >> >> >> Am 2018-11-14 um 11:39 schrieb Jan U. Hasecke: >>> Hi all, >>> >>> attached you find my colormanagement tests and I need your help to >>> understand and debug the situation. >>> >>> I am testing together with a friend of mine, a professional >>> colormanager, who does not know ConTeXt. >>> >>> >>> There are several files in the archive: >>> >>> The differences in the files are the color definition and the color >>> profile used. >>> >>> - rgb-xxx.tex – colors are defined with RGB values only. >>> >>> - rgb-cmyk-xxx.tex – colors are defined with RGB and CMYK values. >>> >>> The cmyk colors are derived from the rgb values using gimp and the >>> color profiles sRGB/ISOCoated >>> >>> - cmyk-xxx.tex – colors are defined with CMYK values only. >>> >>> The xxx stand for two color profiles: iso-coated and swop. >>> >>> What I see is this: >>> >>> Colors in pdfs are the same no matter what color profile I choose. >>> >>> With rgb values and rgb/cmyk values I get the same colors in pdf (the >>> wrong ones). >>> >>> With cmyk values only I get other colors in pdf. Next week my friend >>> will test if these are the right ones. >>> >>> I have many questions: >>> >>> 1. Is colormanagement working in ConTeXt at all? >>> 2. Is my code correct? >>> 3. Why do pdfs with different color profiles show the same colors? >>> 4. Why does ConTeXt not take the cmyk colors from \definecolor when >>> there are rgb values as well? >>> 5. Where can I define a coresponding rgb profile? In Scribus you have to >>> define two profiles (eg. sRGB and ISOCoated) to make colormanagement work. >>> >>> TIA >>> juh >>> ___ >>> If your question is of interest to others as well, please add an entry to >>> the Wiki! >>> >>> maillist : ntg-context@ntg.nl / >>> http://www.ntg.nl/mailman/listinfo/ntg-context >>> webpage : http://www.pragma-ade.nl / http://context.aanhet.net >>> archive : https://bitbucket.org/phg/context-mirror/commits/ >>> wiki : http://contextgarden.net >>>
Re: [NTG-context] Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
Thanks a lot, Peter. Am 14.11.18 um 14:58 schrieb Peter Rolf: > Hi Jan, > > I donno if things have changed (ConTeXt is a fast moving target), so > take my answers with a grain of salt. > > (1) > AFAIK there is no ACTIVE color management in ConTeXt in the sense that > there is an automatic color conversion from one profiled(!) colorspace > into another profiled color space. This means that all given colors > (objects) have to be in the correct (profiled) color space already! > > Objects with embedded color profiles (e.g. a PDF bitmap graphic with icc > profile) will use those. Objects without a profile will use the > corresponding "default" color space profiles. These default color space > profiles can be defined via "profile" in \setupbackend. > This way every color in the PDF is defined properly. This would clarify some of the issues. When I define rgb colors AND use not-print-modus I get the right rgb colors in the pdf. When I define cmyk colors AND use print modus I get colors that might be correct (tested next week) But obviously it is not possible to define both color spaces in \definecolor because I don't get the same colors in the pdf as with the cmyk-only defined file. Maybe I misunderstood this, I've got a hint here, that I could define rgb and cmyk in the same \definecolor and choose the right color space in \setupcolors. The correct method of defining rgb AND cmyk in the same file would be to put the definecolor command inside a startstopmode-environment. Can someone confirm this? > > (2) > > I think so. Can't test, because my Windows 10 is beyond repair after > three "upgrades" and Acrobat is not working properly anymore. > > (3) > > Judging from the size of the final PDF, the icc profile is not embedded. > The profiles have to be installed in "the right place" (this includes > ConTeXt but also the PDF viewer software). > > See "ICC profiles" section at > > https://wiki.contextgarden.net/PDFX > With --mode=print (which uses the color profiles) the pdf get bigger. >10.000 compared to 8.000 without the mode. So I would guess that they are included. I hope I get this sorted out, because I want to print a series of folders and other print products with ConTeXt in the near future. juh > (5) see (1) and (3) > > > > Hope this helps, > > > Peter > > > Am 2018-11-14 um 11:39 schrieb Jan U. Hasecke: >> Hi all, >> >> attached you find my colormanagement tests and I need your help to >> understand and debug the situation. >> >> I am testing together with a friend of mine, a professional >> colormanager, who does not know ConTeXt. >> >> >> There are several files in the archive: >> >> The differences in the files are the color definition and the color >> profile used. >> >> - rgb-xxx.tex – colors are defined with RGB values only. >> >> - rgb-cmyk-xxx.tex – colors are defined with RGB and CMYK values. >> >> The cmyk colors are derived from the rgb values using gimp and the >> color profiles sRGB/ISOCoated >> >> - cmyk-xxx.tex – colors are defined with CMYK values only. >> >> The xxx stand for two color profiles: iso-coated and swop. >> >> What I see is this: >> >> Colors in pdfs are the same no matter what color profile I choose. >> >> With rgb values and rgb/cmyk values I get the same colors in pdf (the >> wrong ones). >> >> With cmyk values only I get other colors in pdf. Next week my friend >> will test if these are the right ones. >> >> I have many questions: >> >> 1. Is colormanagement working in ConTeXt at all? >> 2. Is my code correct? >> 3. Why do pdfs with different color profiles show the same colors? >> 4. Why does ConTeXt not take the cmyk colors from \definecolor when >> there are rgb values as well? >> 5. Where can I define a coresponding rgb profile? In Scribus you have to >> define two profiles (eg. sRGB and ISOCoated) to make colormanagement work. >> >> TIA >> juh >> ___ >> If your question is of interest to others as well, please add an entry to >> the Wiki! >> >> maillist : ntg-context@ntg.nl / >> http://www.ntg.nl/mailman/listinfo/ntg-context >> webpage : http://www.pragma-ade.nl / http://context.aanhet.net >> archive : https://bitbucket.org/phg/context-mirror/commits/ >> wiki : http://contextgarden.net >> ___ >> > > ___ > If your question is of interest to others as well, please add an entry to the > Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context > webpage : http://www.pragma-ade.nl / http://context.aanhet.net > archive : https://bitbucket.org/phg/context-mirror/commits/ > wiki : http://contextgarden.net > ___ >
Re: [NTG-context] Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
Hi Jan, I donno if things have changed (ConTeXt is a fast moving target), so take my answers with a grain of salt. (1) AFAIK there is no ACTIVE color management in ConTeXt in the sense that there is an automatic color conversion from one profiled(!) colorspace into another profiled color space. This means that all given colors (objects) have to be in the correct (profiled) color space already! Objects with embedded color profiles (e.g. a PDF bitmap graphic with icc profile) will use those. Objects without a profile will use the corresponding "default" color space profiles. These default color space profiles can be defined via "profile" in \setupbackend. This way every color in the PDF is defined properly. (2) I think so. Can't test, because my Windows 10 is beyond repair after three "upgrades" and Acrobat is not working properly anymore. (3) Judging from the size of the final PDF, the icc profile is not embedded. The profiles have to be installed in "the right place" (this includes ConTeXt but also the PDF viewer software). See "ICC profiles" section at https://wiki.contextgarden.net/PDFX (5) see (1) and (3) Hope this helps, Peter Am 2018-11-14 um 11:39 schrieb Jan U. Hasecke: > Hi all, > > attached you find my colormanagement tests and I need your help to > understand and debug the situation. > > I am testing together with a friend of mine, a professional > colormanager, who does not know ConTeXt. > > > There are several files in the archive: > > The differences in the files are the color definition and the color > profile used. > > - rgb-xxx.tex – colors are defined with RGB values only. > > - rgb-cmyk-xxx.tex – colors are defined with RGB and CMYK values. > > The cmyk colors are derived from the rgb values using gimp and the > color profiles sRGB/ISOCoated > > - cmyk-xxx.tex – colors are defined with CMYK values only. > > The xxx stand for two color profiles: iso-coated and swop. > > What I see is this: > > Colors in pdfs are the same no matter what color profile I choose. > > With rgb values and rgb/cmyk values I get the same colors in pdf (the > wrong ones). > > With cmyk values only I get other colors in pdf. Next week my friend > will test if these are the right ones. > > I have many questions: > > 1. Is colormanagement working in ConTeXt at all? > 2. Is my code correct? > 3. Why do pdfs with different color profiles show the same colors? > 4. Why does ConTeXt not take the cmyk colors from \definecolor when > there are rgb values as well? > 5. Where can I define a coresponding rgb profile? In Scribus you have to > define two profiles (eg. sRGB and ISOCoated) to make colormanagement work. > > TIA > juh > ___ > If your question is of interest to others as well, please add an entry to the > Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context > webpage : http://www.pragma-ade.nl / http://context.aanhet.net > archive : https://bitbucket.org/phg/context-mirror/commits/ > wiki : http://contextgarden.net > ___ > ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
I forgot the archive. :-( Am 14.11.18 um 11:39 schrieb Jan U. Hasecke: > Hi all, > > attached you find my colormanagement tests and I need your help to > understand and debug the situation. > > I am testing together with a friend of mine, a professional > colormanager, who does not know ConTeXt. > > > There are several files in the archive: > > The differences in the files are the color definition and the color > profile used. > > - rgb-xxx.tex – colors are defined with RGB values only. > > - rgb-cmyk-xxx.tex – colors are defined with RGB and CMYK values. > > The cmyk colors are derived from the rgb values using gimp and the > color profiles sRGB/ISOCoated > > - cmyk-xxx.tex – colors are defined with CMYK values only. > > The xxx stand for two color profiles: iso-coated and swop. > > What I see is this: > > Colors in pdfs are the same no matter what color profile I choose. > > With rgb values and rgb/cmyk values I get the same colors in pdf (the > wrong ones). > > With cmyk values only I get other colors in pdf. Next week my friend > will test if these are the right ones. > > I have many questions: > > 1. Is colormanagement working in ConTeXt at all? > 2. Is my code correct? > 3. Why do pdfs with different color profiles show the same colors? > 4. Why does ConTeXt not take the cmyk colors from \definecolor when > there are rgb values as well? > 5. Where can I define a coresponding rgb profile? In Scribus you have to > define two profiles (eg. sRGB and ISOCoated) to make colormanagement work. > > TIA > juh > ___ > If your question is of interest to others as well, please add an entry to the > Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context > webpage : http://www.pragma-ade.nl / http://context.aanhet.net > archive : https://bitbucket.org/phg/context-mirror/commits/ > wiki : http://contextgarden.net > ___ > <> ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
Hi all, attached you find my colormanagement tests and I need your help to understand and debug the situation. I am testing together with a friend of mine, a professional colormanager, who does not know ConTeXt. There are several files in the archive: The differences in the files are the color definition and the color profile used. - rgb-xxx.tex – colors are defined with RGB values only. - rgb-cmyk-xxx.tex – colors are defined with RGB and CMYK values. The cmyk colors are derived from the rgb values using gimp and the color profiles sRGB/ISOCoated - cmyk-xxx.tex – colors are defined with CMYK values only. The xxx stand for two color profiles: iso-coated and swop. What I see is this: Colors in pdfs are the same no matter what color profile I choose. With rgb values and rgb/cmyk values I get the same colors in pdf (the wrong ones). With cmyk values only I get other colors in pdf. Next week my friend will test if these are the right ones. I have many questions: 1. Is colormanagement working in ConTeXt at all? 2. Is my code correct? 3. Why do pdfs with different color profiles show the same colors? 4. Why does ConTeXt not take the cmyk colors from \definecolor when there are rgb values as well? 5. Where can I define a coresponding rgb profile? In Scribus you have to define two profiles (eg. sRGB and ISOCoated) to make colormanagement work. TIA juh ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
[NTG-context] Issues with RGB to CMYK conversion with color profiles (was: Colormanagement)
Hi all,
with the following file I tested the color conversion of context.
I get the same CMYK-values in the output pdf file using different color
profiles. A friend of mine can test the color values of PDF with a
special software.
My guess: the profiles are not used during pdf generation.
You can test this by commenting/uncommenting the other profile.
I created the files with
context --mode=print example.tex
My context version is
mtx-context | ConTeXt Process Management 1.02
mtx-context | current version: 2018.08.30 18:41
Is this the correct way of producing cmyk-pdfs?
I am missing the declaration of the RGB color profile. When doing color
management in Scribus I define two profiles: one for RGB and one for
CMYK. AFAIK you need both to convert rgb to cmyk.
Any hints?
juh
--- example.tex ---
\definecolor [hs-logoblau] [r=0.000, g=0.314, b=0.580]
\definecolor [hs-dunkelblau] [r=0.258, g=0.474, b=0.737]
\definecolor [hs-hellblau] [r=0.6, g=0.737, b=0.858]
\definecolor [hs-orange] [r=0.866, g=0.286, b=0.003]
\startnotmode[print]
\setupcolors[cmyk=no,rgb=yes]
\stopnotmode
\startmode[print]
\setupcolors[cmyk=yes,rgb=no]
\setupbackend[
format=PDF/X-1a:2003,
% intent={ISO Coated v2 300\letterpercent\space (ECI)},
intent={SWOP2006_Coated3v2.icc},
]
\stopmode
\setuppapersize [A4] [A4]
\starttext
\blackrule[width=3cm,height=1cm,depth=0pt,color=hs-orange] HS Orange
r=0.866, g=0.286, b=0.003
\blank
\blackrule[width=3cm,height=1cm,depth=0pt,color=hs-logoblau] HS Logoblau
r=0.000, g=0.314, b=0.580
\blank
\blackrule[width=3cm,height=1cm,depth=0pt,color=hs-dunkelblau] HS
Dunkelblau r=0.258, g=0.474, b=0.737
\blank
\blackrule[width=3cm,height=1cm,depth=0pt,color=hs-hellblau] HS Hellblau
r=0.6, g=0.737, b=0.858
\stoptext
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___
