Re: Difference between Apple CMM and Heildelberg CMM
Re: Difference between Apple CMM and Heildelberg CMM
- Subject: Re: Difference between Apple CMM and Heildelberg CMM
- From: Henrik Holmegaard <email@hidden>
- Date: Mon, 30 Apr 2001 08:07:31 +0200
Steven Kornreich <email@hidden> wrote:
>
All my cmyk printer profiles
>
are all created in Print Open 4.0 so I was wondering if I should change the
>
CMM of my input profile in Chromix to Heildelberg or I should I not even
>
worry about this.
After ColorSync 3.0 the Heidelberg CMM is the default CMM in the Microsoft
Image Color Management 2 (ICM2) extension, replacing the low quality Kodak
CMM implementation for ICM1. Therefore, Printopen 4 writes HDM for CMM type
into its profiles.
ColorSync 3.0 introduced the Apple CMM as default CMM for Mac OS systems,
replacing the Heidelberg CMM as default CMM. In Mac OS X ColorSync 3 is not
an optional extension, but is integrated right into the graphics engine, so
having the Apple CMM as the default CMM makes sense from Apple's point of
view.
On Mac OS the Apple CMM and the Heidelberg CMM are both open and use no
proprietary tags. You may use them interchangeably.
And let's try to keep a lid on CMM issues overall. It's strategic industry
stuff and therefore highly explosive. From a user point of view what we need
to think about is how to measure and apply profiles properly. We can't do
anything with CMMs except choose among those which are open and
non-proprietary.