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At 9/2/2003 01:47 PM, cnettles wrote:
>When is indexed color an issue in a press-ready pdf file?
Operationally, it should never be a "issue" in a press-ready PDF
file. Indexed CMYK and RGB are part of both the PostScript and PDF
specifications and are treated exactly the same as the corresponding
32-bit CMYK and 24-bit RGB images respectively. The difference is
that the actual colors used are the result of a "look-up operation"
on a 256-entry table.
The only "issue" that could come up would be if the actual image(s)
in question really required more than 256 distinct colors and were
somehow "dumbed-down" to indexed color arbitrarily (and capriciously?!?).
Note that certain image types, such as computer screen shots, often
fit well into an indexed colorspace. Color photographic images would
very, very, very rarely fit into the category of images that could
do with only 256 distinct colors.
- Dov
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