converting printable colours
converting printable colours
- Subject: converting printable colours
- From: "John Swift" <email@hidden>
- Date: Thu, 15 Apr 2004 21:47:19 -0400
I am trying to figure out why converting files to output profiles in which
none of the colours are out of gamut, produces different results using
perceptive and relative rendering intents. I had often noticed a slight
change in luminance in printable patches when converting with colorimetric
relative but never stopped to study it closer. This change is independent
of black point compensation and occurs even with a simple single colour
file. For example a file either in greyscale or RGB filled with 50% grey
converted to any number of printer profiles using relative rendering intent
produces different data when the same file is converted using perceptive. I
first became intrigued with this problem while trying to soft proof a 21
step wedge. Despite the fact that I was getting no out of gamut warning the
output profile wanted to translate L* 8 (RGB 29 in Adobe 1998) all the way
to L*18 ( RGB 49 ) by a single and unchanging code, of course using the
perceptive intent rounded off the results, I just became curious as to why
it was happening and frustrated that I couldnt produce precise and
consistent densities from file data. Any help to understand this would be
appreciated, thank you.
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