On Mon, Jun 3, 2019 at 4:12 PM Jan-Peter Homann <hom...@colormanagement.de> wrote: > > 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?
Yes. There's also an abandoned attempt to get the freedesktop version onto github, but the maintainer dissapeared. > > 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 RGBA(sRGB). The only raster type supported right now is PNG. There were some talks about cs support, but the previous maintainer dissapeared before anything could be done. > > 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. Krita too uses per-node color spaces. What is more a concern here is that the main layer format is PNG, and while there has been discussion about supporting other types, this was never implemented. > > 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:hom...@colormanagement.de > > _______________________________________________ > CREATE mailing list > CREATE@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/create We've now put everything on OpenRaster.org, which is hosted on the KDE websites. What we should probably do is ask KDE sysadmin if we can have a project for OpenRaster on the KDE gitlab. That way we can maybe start moving forward by using issues as discussion. -- Wolthera _______________________________________________ CREATE mailing list CREATE@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/create
