On 16 October 2014 21:37, Øyvind Kolås <pip...@gimp.org> wrote: > On Thu, Oct 16, 2014 at 6:52 PM, Elle Stone > <ellest...@ninedegreesbelow.com> wrote: > > On 10/15/2014 01:46 PM, Simon Budig wrote: > > If I understand them correctly, Michael Henning and Jon Norby are saying > > that the criteria is something along the lines of: "For RGB editing > > operations, use UserRGB primaries *unless* there's a really, really good > > reason why only sRGB primaries will work." > > > > Is there in fact general agreement among the devs that the criteria for > > deciding when to use sRGB primaries instead of UserRGB primaries is > > approximately as follows? > > Once we have the vocabulary to also describe this aspect of the > pixelformats used by operations, the first thing we should do is to > annotate all the operations which are broken when done with sRGB > primaries, then we will be able to continue refactoring, profiling and > optimizing; without breaking existing functionality/rendering. Not > only in terms of making more operations request directly userRGB, but > also doing things like make some linear operations accept any of > userRGB or bablRGB (or other linear RGB); and creating output buffers > in the same format – to avoid unnecessary conversions in such cases. > > Using a fixed linear RGB format instead of userRGB is what for some > operations will provide the consistent results for the same property > values / slider positions. Knowing which operations this is important > for is easier to determine when we have code providing the vocabulary > in babl. The further along on the roadmap, more of the road will have > to be laid/determined as we walk it.
Hi pippin, you are answering in detail 'how we will get "there"' but Elle (as I see it) is asking more 'do you agree that we want to go "there"'. This leaves me unsure if you are implicitly agreeing, if you disagree and have a different "there" in mind, or if you think it is too early to decide this. "There" being the goal that *eventually* in GEGL 'For RGB editing operations, use UserRGB primaries *unless* there's a really, really good reason why only sRGB primaries will work.' -- Jon Nordby - www.jonnor.com
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