How to use Pantone colours with Scribus: Difference between revisions

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==Spot colours==
#redirect [[How to use spot colours with Scribus]]
 
Spot colours are colours made from pure ink, rather than being a mixture of the primary colours of CMYK (or other colour space).
 
Spot colours may be desired for two reasons:
 
* economy: if the document to print contains less than the number of primary (4 in the case of CMYK) it may be less expensive to use spot colours than to render them as a mixture of the primaries
 
* quality: it isn't allways possible equal a certain colour with a mixture of inks
 
More on spot colours can be found [http://en.wikipedia.org/wiki/Spot_color here].
 
The PDF specification supports the concept of spot colour. In terms of PDF information a spot colour is merely a colour reference which is defined by a name. This name is supposed to be known and will determine how the colour is printed.  A PDF spot colour also includes the RGB/CMYK information to be used  in cases where spot colours are not supported, eg, viewing the file with a PDF reader.
 
More on PDF spot colors [http://partners.adobe.com/public/developer/en/pdf/PDFReference16.pdf here] (see pages 234 and 532)
 
Scribus provides a way to generate PDFs with spot colours: it is as simple as checking the corresponding checkbox in the '''Edit Colour''' window.
 
[[Image:Edit colour spot checkbox.png]]
 
==Pantone colors==
 
The Pantone color set is a list of colors maintained by a company with the
same name. To each color corresponds a name assigned by Pantone.
 
The Pantone set exists only on paper. There is no such thing as "on screen
Pantone colors".
 
In terms of software, Pantone colors are treated as spot colors. To produce a
document with Pantone colors, one must:
 
# choose the colors on a Pantone color table
# mark the colors used in the document as spot colors, and assign the the correct Pantone names.
#assign them RBG or CMYK values (optional: doesn't affect how the final result comes from the press...)
#generate the PDF leaving the option "Convert spot colors to process colors" unchecked
#handle the PDF file to a print shop that supports Pantone
 
Although the Pantone color table contains and RGB triplet for each color, the
way the color looks on screen (either on Scribus or on the generated PDF) is
irrelevant, because it will be printed according to its name.
 
Of course, it's better if the document on screen is as closer as possible
(this doesn't mean very close) to the final one, so assigning RGB values may
help for visualization. If one wants a very rough preview on a regular
printer, the CMYK values from the Pantone table should be assigned instead.
 
Some programs like Quark Express already come with built in list of Pantone
color names and RGB/CMYK "representations". In terms of workflow this feature
eliminates the need for steps 2 and 3. However since there is no real on
screen representation, the most important step, which is step 1, must be
kept.
 
The reason Scribus doesn't have such a table built-in, is caution regarding
potential legal issues with Pantone. However one can build such a table for
personal use and include it on Scribus.rc

Latest revision as of 23:37, 5 May 2006