null match
null match
- Subject: null match
- From: John Zimmerer <email@hidden>
- Date: Wed, 10 Jul 2002 22:21:49 -0700
Graeme,
Data isn't touched (i.e., no match occurs) when the AppleCMM sees that
source = destination. This is the convention adopted by the ICC and is
done to avoid potential rounding errors as you move from device to PCS
and back.
John Z.
Date: Thu, 11 Jul 2002 13:20:37 +1000
From: Graeme Gill <email@hidden>
To: email@hidden
Subject: Re: OS X ColorSync Utility
email@hidden wrote:
"Same as source" (null transforms, and with smart software no
transform if it
sees that it is about to make a null transform) is one solution to
avoiding
undesired color conversions... are you sure thats not the situation
you are
seeing, Chris?
Isn't it kind of dangerous to assume that just because the source and
destination
profiles are the same, that this is the same as doing nothing ?
There is a huge difference between doing nothing and transforming
through
the source and destination profiles. The profiles may apply gamut
compression,
will lose black information, regenerate black separation, and may apply
ink
limiting. Surely there should be a preference selection about whether
"source == destination" does nothing or passes the data through the
profiles ?
Graeme Gill.
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