[argyllcms] Re: Quality problems on limited gamut media
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 05 Apr 2008 02:29:03 +1100
Mihai Zahorski wrote:
I get very promissing results using argyll with glossy paper, but the
profiles made for uncoated thin paper yeld images with washed out colors. So
everything looks less saturated and areas with similar colors loose a lot of
detail. I'm very interested in using the perceptual intent, for which I've
set sRGB as source gamut, but the results are still less satisfying than
using the default profiles for the printer. Is there any issue with such
media in Argyll? I'm using version 0.6.
I'd suggest at least trying out V0.7 Beta8, and seeing if that
is any different, as some of the black level and neutral
axis mapping has changed since V0.6.
Without further information (ie. the profile, an example of
the type of imagery), it's hard to do more than speculate though.
It most likely comes down to intent. Perceptual aims to
include the whole source gamut, and do so in a way
that preserves the distinction between all the source
colors. If you have a limited gamut device and an image
that occupies a smaller portion of the source gamut,
then it is likely to be squeezed into a disappointing result.
There are a number of ways this could be addressed. One would
be to make a gamut for the source image, and taylor the
gamut mapping for that rather than the color space the image
is in (profile -g option, icclink -G option].
Another would be to use a gamut mapping that deliberately enhances
saturation, such as saturation (intent ms), or enhanced saturation
(intent s).
Finally you could try using an intent that doesn't try and
preserve the whole of the source gamut, such as colorimetric
(intent r, or la).
I hope this is some help.
Graeme Gill.
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