[argyllcms] Re: Image dependent ?
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 13 Nov 2018 09:53:36 +1100
Yves Gauvreau wrote:
Hi,
Q1 I'd like to have a better understanding of how collink does this, is it
explained somewhere?
collink isn't doing anything different to what it usually does.
What is different is where the source gamut is coming from - i.e.
from the image rather than the colorspace.
You say above, using a large gamut space cause a lot of
compression, how does doing this with the gamut of the image reduces the
compression and is there a way to visualize this?
By definition an image encoded in a colorspace must have a gamut
no larger than the colorspace. In a very large gamut colorspace,
any real world image will certainly have a smaller gamut than
the colorspace. (The very large gamut colorspaces generally
have encodings that go beyond real world colors into imaginary colors.)
You can visualize the gamuts using the iccgamut and tiffgamut tools
to generate gamut files (.gam) and viewgam to compare them.
collink also has an option for saving the gamut mapping visualization (-P).
Q2 I have mostly version 4 paper profile for now, is there a way to use them
somehow as shown here? A work around maybe?
Sorry, no. Since the main use of ArgyllCMS is in creating profiles, and since
ICCV4 adds little in the way of technical advantage of ICCV2, adding support
for V4 is not something I've been concentrating on.
I have an I1 Display Pro, I wonder if you would have a suggestion for a
spectrophotometer so I can do my own paper profiles, I know this makes 3
questions.
If your budget is limited, then an X-Rite ColorMunki/i1Studio spectrometer
is about the only choice. If your budget is a little larger, then an X-Rite
i1pro2 is the best choice.
Cheers,
Graeme Gill.
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