gimp and ICC color working spaces

On 11/21/2012 10:20 AM, Thomas Richter wrote:
On 20.11.2012 05:27, Dale wrote:
On 11/18/2012 04:32 AM, Thomas Richter wrote:
Am 18.11.2012 04:42, schrieb Dale:
On 11/17/2012 06:05 AM, Thomas Richter wrote:
The ICC profile contains enough information to convert from the device
color space to the PCS and back


the profile intent choices define the PCS and instantiate it in the CMM

No, it doesn't.


then how does the CMM connect intent choice on both the input and output


Why don't you just download the ICC specs from color.org and study it?

The ICC profile defines how to map the device colorspace to the PCS by
including tables and/or parameters for the transformation.

The PCS is constant, but depending on the ICC profile, more than one
table/parameters exists how to implement the mapping. The CMM checks the
rendering intent, and then picks table A, B or C that transforms the
device colors to the PCS coordinates. The PCS stays always the same,
typically XYZ. Despite this explicit dependency, the CMM may also
(implicitly) make rendering-intent specific algorithmic choices, for
example how to handle out-of-gammut colors or how to implement an
adaption on the illumination source.

Greetings,
Thomas


I think I got it now, Thanks

--
Dale