[argyllcms] Re: R: Re: Neutralize Grey Axis
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 10 Jan 2011 23:41:56 +1100
Klaus Karcher wrote:
Quote from ProfileMaker Documentation:
"Perceptual Rendering Intent Option
Note: This corresponds to relative colorimetry in highlight areas and
absolute colorimetry with shadow compensation in the remaining colors.
Note: The default and recommended setting is Neutral Gray.
Hi Klaus,
thanks for the clearer explanation. It's difficult to believe
that the "Neutral Gray" option gives results that people actually find
useful though, particularly for relative colorimetric. I can understand
using this sort approach as a hybrid "absolute colorimetric" type intent,
but the results with typical source colorspaces (ie. sRGB with a D65
white point) could only look peculiar - very blue looking neutrals
until they switch to the D50 paper white near white !
For example, if B/W and color images are positioned next to each other
in reproduction, the Paper Gray Axis option should be selected to
achieve the same impression in the neutral tones both in the B/W images
and in the color images.
But side by side proofing should use absolute colorimetric, not relative!
If someone wants to achieve a similar effect using Argyll, they can do so
by creating a device link. Look at the -w option combined with
absolute colorimetric <http://www.argyllcms.com/doc/collink.html#w>.
cheers,
Graeme Gill.
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