Gustavo Homem wrote: > Spot colors may be desired for [several] 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 colors than to > render them as a mixture of the primaries.
extra: This is often used in newsprint, where advertisers may be able to use only black and red, for example. > - quality: it isn't allways possible equal a certain color with a mixture of > inks That arguably needs to be broken up into two: Consistency: A spot colour lets the printer guarantee a much more accurate match to a specific real-world colour. For this reason spot colours are often used for things like corporate logos, where consistency and accurate matching is important. Special inks: Using spot colours permits the printing of designs that use special colours or inks that can't be represented in CMYK. The most common examples are out-of-gamut colours (like some very saturated blues and oranges) and metallic inks (gold, silver, copper print, etc), but other inks, such as flourescent inks, also exist. I really like your further explanation of spot colours and PANTONE, especially re on-screen rep etc. I'd love to see that in the Scribus documentation. -- Craig Ringer
