P: RGB Curves

simply forgot to click

I applaud your comment, but didn't see the vote count go up - are you holding out?

I would like to be able to use RGB curves strictly as an artistic tool, not for real color correction as there are already fine tools for that. But giving a bit more blue to the shadow area, while tinting the highlights to warmer tones and removing green from midtones is what curves really are fine for. As said before, not so much neccessary for getting the "real" colors but for mixing them up to create some old film look.

I was able to restrict the search, but when I clicked the links, I was taken to generic forum pages with everything on them - I mustof done something wrong...

Anyway, RGB channel curves are not, specifically, high-priority items for me either. However, some better way to target and adjust color, is - I'm just trying to cover all the bases...

Thanks Rob. These don't seem to be high priority items for me personally. Regarding Google syntax: "[search terms] site:[suffix of domain]", e.g., "RGB curves site:support.bibblelabs.com".

One way to think of it is it gives you the ability to adjust the white balance at all luminosities. Sorta like split toning divided into an infinite number of regions, instead of just two. There is more than one use for it, but perhaps the two most common are:

1. Correct for luminosity dependent color casts.
2. Creative color adjustment for effect.

PS - Its available in Aperture, NX2, DPP, CaptureOne, & Bibble, in case you want to try it for yourself.

There have been lots of good discussions about it on the other forum, unfortunately the search is broken there, and I can't seem to remember the correct syntax for using google to do it.

I may come up with some concrete examples for this thread at some point...

IF the request has to do with the so called “master curve issue” I’d suggest this article (LR/ACR and Photoshop are different beasts as explained here):

http://www.luminous-landscape.com/ess...

Rob, can you give (an) example(s) for what you would do with RGB curves?

Dunno. I would say though that the more powerful *other* color adjustment tools are, the less RGB curves are "needed". I'd also say that editing RGB curves is about as "unwieldy" a way to adjust color is one could possibly get, and is consequently very un-Lightroom-like. On the other hand, it allows one to do things that would otherwise be impossible with the existing color tools. And maybe its not much more unwieldy than adjusting tone using the point curve.

My version of PS (Elements 😎 has red, yellow, green, cyan, blue and magenta under HSL while Lightroom has red, orange, yellow, green, aqua, blue, purple, and magenta. The stated reason for this is that this particular set of color separations better divide the colors we see in common images. Yes, I know about the sliders in PS that allow you to change the color range affected.

This makes me wonder if red, green and blue makes any sense like it did in PS when we were processing images that were already in an RGB color mode. Why not separate the colors in some different way, possibly more like HSL does?

I don't know if that idea has any merit, I'm just thinking out loud here.