Re: [Gimp-developer] Lab conversion, GEGL, RGB space, Illuminant

2010-08-11 Thread Edward Coffey
On 12 August 2010 03:19, Rupert Weber wrote: > Disclaimer: I am not a color buff. Anybody who actually *knows* about > that stuff, please chime in. I'm hardly a color buff either, but I'm going to chime in with a related query: My understanding of GEGL (and, I assume, a fully GEGL-based GIMP) is

Re: [Gimp-developer] 2.7.3 Performance

2010-08-11 Thread David Gowers
On Thu, Aug 12, 2010 at 7:24 AM, Alexia Death wrote: > On Wednesday, August 11, 2010 06:04:36 David Gowers wrote: >> On Wed, Aug 11, 2010 at 12:12 PM, David Gowers <00a...@gmail.com> wrote: >> > On Wed, Aug 11, 2010 at 10:25 AM, GSR - FR >> > wrote: GIMP is a jerk (I get >> > cases where I draw a

Re: [Gimp-developer] Lab conversion, GEGL, RGB space, Illuminant

2010-08-11 Thread James Cox
> Disclaimer: I am not a color buff. Anybody who actually *knows* about > that stuff, please chime in. > > PAL/SECAM vs sRGB > = > While writing the Lab/LCH layer mode stuff, I wondered so far why the > result is still slightly different from the current GEGL implementation > of Col

Re: [Gimp-developer] 2.7.3 Performance

2010-08-11 Thread Alexia Death
On Wednesday, August 11, 2010 06:04:36 David Gowers wrote: > On Wed, Aug 11, 2010 at 12:12 PM, David Gowers <00a...@gmail.com> wrote: > > On Wed, Aug 11, 2010 at 10:25 AM, GSR - FR > > wrote: GIMP is a jerk (I get > > cases where I draw a curve and the middle of it gets flattened into a > > straig

Re: [Gimp-developer] Lab conversion, GEGL, RGB space, Illuminant

2010-08-11 Thread yahvuu
Hi, On 11.08.2010 19:19, Rupert Weber wrote: > PAL/SECAM vs sRGB > = > While writing the Lab/LCH layer mode stuff, I wondered so far why the > result is still slightly different from the current GEGL implementation > of Color/Hue/Saturation/Value modes. > > Now after taking a quick

Re: [Gimp-developer] Lab conversion, GEGL, RGB space, Illuminant

2010-08-11 Thread Simon Budig
Rupert Weber (g...@leguanease.org) wrote: > D50 vs D65 > == > Another question during transformation to Lab is, which illuminant or > reference white to use. > > That part, I don't quite understand yet. Does that depend on the source > data, or simply on how the monitor is calibrated? W

[Gimp-developer] Lab conversion, GEGL, RGB space, Illuminant

2010-08-11 Thread Rupert Weber
Disclaimer: I am not a color buff. Anybody who actually *knows* about that stuff, please chime in. PAL/SECAM vs sRGB = While writing the Lab/LCH layer mode stuff, I wondered so far why the result is still slightly different from the current GEGL implementation of Color/Hue/Satur