Hello,

The last discussion about using CIE LCH for some layer modes made me remember that there is a CIE LCH color selector plugin for GIMP that many people would like to see included in the main GIMP distribution sooner or later. It has room for improvements (for example when colors out of gamut are selected it can lead to some strange color selection results), but it should be a good start to begin from.

Of course there is the source code available, and it's public domain too, according to the author.

I've attached the tar.gz file to this email.

Martin Nordholts wrote:

Before we add support for picking device-independent colors, the whole color selector should be color managed, and it currently isn't. I'm all for adding a Lab/LCH color picker when that is fixed though.

Ah, I see, thanks anyway for checking it out.

By the way, as I wrote in another message I'm not a GIMP hacker, but by "not color managed" did you refer to this specific implementation of a LCH color picker or rather the whole GIMP color picking system?

Martin Nordholts wrote:

I'm referring to the whole GIMP color picking system. The color picked using the default color picker is not represented in a device-independent way. One of the consequences is that painting with a green brush on a color managed image might not give a green stroke on the image. The absence of a color managed color picker becomes evident in test images which rotates color, i.e. maps e.g. RGB 0,255,0 in the image to RGB 0,0,255 on the screen.

I understand, thanks for explaining.

Can you give a rough estimate of when a color managed picking system will be integrated into GIMP ? I've only recently "discovered" the LCH color space / color selection and I think it's a great system. I know I could for now simply use the current available color selection module (which from what I see is "just" a graphic interface to do LCH->RGB24 color conversions, so it's a sort of "fake" LCH), but it's just my curiosity.

Let me guess: this will happen when GEGL will be fully integrated into GIMP, right (also allowing higher color bit depths which if I'm not wrong the LCH color space needs) ? Then that would be in GIMP 2.10 or even later, I think.