[argyllcms] Re: XYZ/LAB to RGB
- From: Pascal de Bruijn <pmjdebruijn@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 8 Jan 2010 18:28:44 +0100
On Fri, Jan 8, 2010 at 12:12 AM, Klaus Karcher <lists@xxxxxxxxxxxxxxxxx> wrote:
> Pascal de Bruijn wrote:
>>
>> Hi,
>>
>> Argyll uses RGB values in it's ti2 files for printer profiling:
>>
>> SAMPLE_ID SAMPLE_LOC RGB_R RGB_G RGB_B XYZ_X XYZ_Y XYZ_Z
>> 29 "B12" 22.745 18.431 73.333 12.622 7.4458 48.192
>>
>> Say I have some XYZ or LAB values, how can I compute the proper RGB
>> values?
>
> the XYZ values in ti2 files are estimated and only intended for validation
> purposes. Why do you want to transform them to RGB?
>
> see
> <file:///Applications/argyll/Argyll_V1.1.0_RC1/doc/File_Formats.html#.ti2>
>
>> And is there an easy way to do this for larger data sets?
>
> you can use icclu, xicclu or fakeread to transform colors from/to different
> colorspaces.
Well, that's more or less my question in what colorspace are the RGB
values in a ti2 file? sRGB?
Basically I'd like to be able to add these patches to a printer target:
http://www.oyranos.org/wiki/images/a/aa/ColorChecker_vendor_D50_2deg.cie
This file has XYZ/LAB data, but not RGB, which printtarg seems to
need, since setting the RGB to 0-0-0 produces black patches.
Regards,
Pascal de Bruijn
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