Re: CMKY <-> RGBA transforms?
Re: CMKY <-> RGBA transforms?
- Subject: Re: CMKY <-> RGBA transforms?
- From: Chris Hanson <email@hidden>
- Date: Wed, 21 Jan 2004 16:04:02 -0600
On Jan 21, 2004, at 1:17 PM, lbland wrote:
yup, I'm using a few modified one minus method from adobe, etc., but
it needs some work. About 5 years ago someone on this list gave some
different ones, but I don't remember them. I don't see any functions
to get transformation profiles from a ColorSync lib either.
Probably not someone on this list, as this list was created in 2001 or
so.
In any case, you don't "get transformation profiles from a ColorSync
lib." That's not what ColorSync is. ColorSync is an engine for
performing color matching. So you set up a transformation using a
source and destination color space, and then ask ColorSync to apply
that transformation to something. You can apply a transformation to an
individual color, for example. Or you can apply a transformation to an
entire image.
On one project back in the late 1990s, I replaced some simple custom
CMYK->RGB code that operated on whole images with calls to ColorSync.
There were dramatic improvements in both speed and quality. I suggest
playing around with it to see if you can achieve the same for your
needs.
-- Chris
--
Chris Hanson <email@hidden>
bDistributed.com, Inc.
Outsourcing Vendor Evaluation
Custom Mac OS X Development
Cocoa Developer Training
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