Ok, so what might you actually do? - just trying to visualise a process… So you’ve opened a raw, picked an important area of skin, can see the Lab values, now you make some adjustments to the picture overall. Referring back to the sample, you see the lightness has changed, fine, but also the hue somewhat. Is this the kind of scenario? And if so, what might you do next? Put the hue back to what it was originally with say the Equaliser using the “HH” function?
It would be useful to be able to pick any point in the image and see the R, G, B, L*, a*, b*, Ch, etc. values of that point while manipulating some curve.
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Yes, and this not only for one pixel but the ability to specify a spot radius over which the measurement is averaged.
Hermann-Josef
@RawConvert It may sound odd, but according to last week’s news, your skin tone matching and my PMS300 needs actually can be combined: Zlatan (a Swedish football player) has just signed a megacontract with Volvo. Wouldn’t it be nice to give him a Volvo blue skin tone? 
Ahhh, I would love to use Raw therapy but without this feature I simply cant. And that’s a shame, because in every other aspect it seems far superior, but its missing this essential tool.
If anyone from RT is reading this please consider adding this feature. It may seem small, but for anyone working in 3D rendering and texturing it is truly essential. I have to say this is one tool where Adobe got it right. Really we need many samplers to see changes in multiple areas simultaneously.
With the addition of this tool RT would be the clear choice for anyone working with texture for rendering. But without it, we simply cant use it at all…
Ohh, also in the navigator it would be nice to be able to chose whether the RGB values show as x/255 or as a percentage. the 255 system is preferable for many.
Really hope this feature gets added.
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Hi PhilipB,
I agree with the first part of your post (of course :-]), but not with the last part (see separate reply to your 255 system posting).
Also: have you noticed how Darktable has solved the Color picker feature?
hey,
No, Im on windows. how did they accomplish it? Im a fan of the photoshop integration where results can be shown as 32-bit float, 16-bit, or 255 RGB, regardless of actual working bit rate. Very helpful.
replied to the x/255 rgb issues in the other thread…
Even if you are on Windows, you can enjoy Darktable &c. This computer is a Win 7/64-bit machine, but thanks to VM Virtualbox I can run any Linux version on it as well, and thus use DT.
Here is how DT handles colour picking.
Ohh, thats nice.
I especially like being able to chose where in the tool chain the sample is taken from. Looks even better than photoshop, thats for sure.
darktable doesn’t allow that (unfortunately).
Just wanted to give this thread a bump see if maybe one of the RT team might have time to chime in and let us know if this feature might make it into the next release…
Fingers crossed on this one 
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Unlikely unless you send a patch.
Persistent color picker tool / Lockable Color Picker · Issue #1812 · Beep6581/RawTherapee · GitHub
By patch do you mean essentially code it myself?
Thats a shame. Is that because its a low priority or for some other reason?
Most develop these programs as a hobby; so when one goes to add features, the most interesting one is chosen, I’d think. Lockable color picker doesn’t seem that interesting, however useful it may be.
Ahhhh, i hear you…
Yeah, I see what your saying. Maybe it’s not sexy…
Have to say though, seems like an fundamental tool which is missing, more than a zany new feature. Also RT is a rather feature packed application…if they had the pickers, I don’t think i could even come up with another feature to request…
Oh please brilliant, attractive, and sexually desirable RT coders…please take on this challenge !!!
I really am serious about the use for 3d and texture artists…I dont know if people really know about RT but its perfectly poised to be the darling of the 3d community…
If there are several people that desire this feature, perhaps you should perhaps talk to a developed about sponsoring some development time.
Not quite what you want I appreciate, but is there an app out there where you can sample any part of any window and it dives off into the video memory internals and reports back the RGB values? With humble windows Paint, you can paste in a screen grab, sample a point, then click “edit colours” and it will tell you the RGB and HSL values. For example the blue “Reply” buttons on this page are RGB 0, 136, 204 according to my system.
I work alone, but i would totally be into sponsoring some coding time…more because I’m down with the open source philosophy. But yeah, if someone wants to implement a light room style lockable color-pickers then get in touch, let me know how I can help.
“but is there an app out there where you can sample any part of any window and it dives off into the video memory internals and reports back the RGB values?”
photoshop and illustrator do this, you have to hold a mod-key when you drag out of canvas, but yeah, adobe has this integrated…my color picker in 3Ds max does this too…
@RawConvert yes, KColorChooser in KDE does that, but the returned values will be rubbish when you use a color-managed workflow. It’s a good utility but not for photography.