Hi Christoph, On Friday 05 May 2006 01:01, Christoph Sch?fer wrote: > Hi Gustavo, > > Am Freitag, 5. Mai 2006 01:27 schrieb Gustavo Homem: > > Hello, > > > > I was asked about pantone color support on Scribus and I found this on > > the wiki: > > > > http://wiki.scribus.net/index.php/Scribus_and_Pantone_colors > > The article is obsolete for 1.3x versions of Scribus. > > > If I understood the comments correctly we should be able to produce a > > PDF with Pantone colors by: > > > > - defining a color in the color editor and marking it as a spot color > > - naming this color as "Pantone 185 C" or any other Pantone name > > - not checking the "Convert spot colors to process colors" on the PDF > > export dialog > > > > Do these steps actually generate a PDF with Pantone colors? Spot colors > > are rendered based on their names, right? > > Spot colours aren't "generated" in a PDF, only the inforomation for the > printer that colour "xyz" is a spot colour called "Pantone blah". The > printer then knows that he has to use an extra plate to print this colour. >
What you mean by printer in this context ? Is it the guy behind the desk at the print shop? Or the machine that prints? Anyway, the question is: do the above steps enable me to produce a PDF which contains the right indications for a "print shop" to produce Pantone colors for me? (even if I had to look them up on a book, and the representation manually I picked for them on the screen is not very faithful) Can I hand over such PDF and expect them to understand it, with no further questions asked? > > If so, the missing bit is an algorithm to display them "correctly" on > > screen, right? > > No ink colour can be displayed "correctly" on screen. It is possible to > come cery close, but accuracy is almost impossible. > I am aware of that, that's why I used the "". I suppose "very close" is what programs that claim Pantone support do... > > On the link above a set of "Pantone" colours to include on scribus.rc is > > mentioned, but it is not available anymore. Does someone have this? > > It probably violated copyrights, and I don't think we should support this. > > > Actually I tried doing that, by creating two colors which were marked as > > spot colors on Scribus. One was called "Pantone 185 C" and the other > > "Foobar xpto". > > > > Then I generated a PDF. I expected Acrobat to only render the former, > > since there is no spot color named "Foobar xpto", but it showed both. > > You defined a colour with either CMYK or RGB values. That's independent of > spot colours. > > The name of the colour and your labeling as a spot colour > will indicate the required colour to the printer. > Can you explain the difference between a spot colour and a non-spot color in terms of what is stored on the PDF? > The only way to handle spot colours effectively is to buy a colour book. > colour books generally contain all informations needed for output: Name, > RGB, CMYK values, HTML codes etc. You have to choose a colour from that > printed book, type in the values (for printing usually CMYK) and the name. > When you export to PDF or Postscript you can decide if you want to override > the spot colour option and let the colour be composed by process colours > instead. > > > So, how can I know when the PDF really contains Pantone colors? > > It doesn't. See above. > It must somehow, or else marking it as "spot color" would have no effect. I don't mean "containing the colors", the question is more: How do I know if this foobar.pdf contains the bits which mark my spot colors as spot colors with the correct names assigned? Sorry for not understanding at first :-) Best regards Gustavo > > Best regards > > Gustavo > > HTH, > > Christoph -- Angulo S?lido - Tecnologias de Informa??o http://angulosolido.pt
