[argyllcms] Re: iccdump -t A2B1 interpretation
- From: <graxx@xxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Wed, 20 Apr 2022 09:01:11 -0400
Graeme,
You wrote :
Neither the input or output is being interpreted as color spaces, since it
mightn't make any sense to do so
given the effect of input and output per channel curves or 3x3 matrix.
Many profiles have 'linear' input/output curves and 'unity' 3x3 matrix.
/ Roger
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> On Behalf
Of Graeme Gill
Sent: April 20, 2022 12:33 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: iccdump -t A2B1 interpretation
graxx@xxxxxxxxxxxx wrote:
I need to explore the encoding of the A2B1 tag (CMYK to Lab).
CLUT table:
0 0 0 0: 0.9961089494 0.5000076295 0.5000076295
0 0 0 1: 0.9387197681 0.5011062791 0.4956588083
It's a fairly raw representation of the table contents. Neither the input or
output is being interpreted as color spaces, since it mightn't make any sense
to do so given the effect of input and output per channel curves or 3x3 matrix.
So input is index - so 0..15 out of 16.
Output is table value normalised to range 0..1.0.
That's it. Conversion from/to colorspace depends on the encoding and input &
output curves and matrix.
xicclu is better if you want to see actual input and output values.
Cheers,
Graeme Gill.
Other related posts:
