[CREATE] Some questions about OpenRaster Format, Color and GEGL

[Jan-Peter Homann]

Hi to all,
It was nice to attend LGM2019 my first time and talk to a lot of LGM 
Developers and Designers. :-))

I want to dive deeper in GEGL and the OpenRaster Format concerning color 
and have some questions:

*1) Current state of the OpenRaster specifications:*
I found following site about the OpenRaster Specifications
1a) https://www.openraster.org/
1b) https://freedesktop.org/wiki/Specifications/OpenRaster/

They have very similar content, but 1a seems to be most up to date 
version. Is this correct?

*2) Whats about Color in OpenRaster ?*
I didn´t found any description about supported Colorspaces and the 
handling of color profiles in the OpenRaster Spec.
So which colorspaces are supported in OpenRaster:
RGB
RGBA
Gray
LAB
1-Bit (Black and White)
CMYK
Spotcolor Channels / Multichannel Images

Does OpenRaster supports embedded ICC profiles?

*3) GEGL and Color*
Pippin, did I understood you at LGM correct, that GEGL is able to use 
different ICC-profiles for chunks/nodes in the GEGL tree ?
If yes, is it correct, that OpenRaster would not be an appropriate file 
format for such cases?
or, If yes, do you provide an extension the the OpenRaster format?
If not, this was probably a missunderstanding from my side...

If yes, the complexity of interactions between colormanagement and 
blending modes will increase massively. Photoshop still avoids this 
complexity by allowing only one profile per document. If any new image 
with a differnt colorspace (e.g. CMYK instead of RGB) or different 
profile (e.g. sRGB instead of AdobeRGB) will be added to an document, 
all image colors will concerted to actual document colorspace.

Best regards
Jan-Peter




-- 
Homann colormanagement    tel: +49 30 611 075 18
Jan-Peter Homann          mob: +49 171 54 70 358
Herzbergstr. 55           www.colormanagement.de
10365 Berlin    mailto:homann at colormanagement.de

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