On Tue, Oct 7, 2014 at 8:10 PM, Elle Stone <ellestone@xxxxxxxxxxxxxxxxxxxx> wrote: > I'm posting to the original thread. Pippin had started a new thread: > https://mail.gnome.org/archives/gimp-developer-list/2014- gmail started a new thread when I tired to change the alarmist subject. > Brasseur shows why scaling needs to be done on linearized RGB. The defining > primaries are irrelevant. Nothing in Brasseur's demonstrations provide any > justification for a forced conversion to "sRGB as PCS". They provide a justification for keeping track of the pixel format of the buffers, or enforcing that only linear spaces are permitted processing spaces. There in practice with regard to data loss, no forced conversion to sRGB. Any more than any use of ICC profiles would be a forced conversion to CIE XYZ. >> Babl provides the vocabulary and set of _defined_ >> units to be able deal with the multitude of temperature units/pixel >> formats in use by different algorithms and libraries. >> > I do understand how babl/GEGL works. There is a difference between > "understanding" and "agreeing". To me it seems like you do not like the fact that the neutrally sounding babl_format name "RGBA float" is strictly defined in the architecture of both babl and GEGL, and see this as the thing in the architecture that should be changed to be *the*processing*space*. While I am arguing that this is existing functionality we need; and that reconfigurable primaries should be a separate addition instead of deleting both neccesary functionality and optimizations for common pixel formats. > Any architecture that requires hacks to make basic editing operations work > is broken. You can dress it up and make it sound like the hacks are just > extending existing functionality. But in this case it's obvious that the > reason for the hacks is to fix something that is only broken because of an > architecture that intends to use "sRGB as PCS". > > Since April I've tried to explain why Pippin's architecture is broken. I've > used logic, examples, equations, pictures, long explanations, short > explanations, and other people's explanations. I have not disagreed that the current architecture is broken, but what you call hacks is how GIMP-2.9 avoids gamma errors when blurring and scaling, regardless of wheter you are editing an 8bit image with its layers stored non-linearly or not; as well as other distinctions where different operations have the need to do processing with different pixel representations. /Ø _______________________________________________ gegl-developer-list mailing list List address: gegl-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gegl-developer-list
