Re: Hexachrome and ICC profiles
Re: Hexachrome and ICC profiles
- Subject: Re: Hexachrome and ICC profiles
- From: Graeme Gill <email@hidden>
- Date: Tue, 10 Dec 2002 12:26:12 +1100
Stefan Fiedler wrote:
>
Is it correct that ICC profiles cannot properly describe Hexachrome
>
(CMYKOG) inks? If so, how do the current "Hexachrome savvy"
>
applications (ColorBlind, Profilemaker,...?) solve this problem?
This is not correct. ICC LUT profiles can handle up to 15 color channels.
In practice this is easy for the output (B2A) table to handle, but you
quickly run into a space/quality problem in the input (A2B) table
as you crank the number of channels up. This is because the ICC LUT
format is general purpose, and doesn't make any assumptions about the
behaviour of a device. In practice its hard to create an ICC input profile
with more than 8 channels with any sort of accuracy, without the profile
blowing up to a ridiculous size (ie. a 10 channel file with a table resolution
of 9 would need about a 2 Gigabyte profile).
So ICC should work with 6 channels quite happily.
Graeme Gill.
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