Start with a photo.
Extract Hue to Colour
Edit > Fill
- Use: 50% Grey
- Mode: Luminosity
Image > Adjust > Hue/Saturation
- Sat = +100
What you will be left with is pure hues.
Quick-n-sleazy, not perfect, but functional.
See: Saturation Out and In
Lately I've been using a variation of that.
After extracting Sat to greyscale and it's on it's own layer, I'll fill Blue and Green with pure black. This will leave Sat in just the Red channel. Tweaks are then done directly to the R channel. For example, if you want to tweak Sat with Curves, use the drop-down in Curves to select the Red channel. This eleminates the need for a Gradient Map.
*Beer in mind that this is Photoshop's flavor of Saturation. This is *not* the same as S in HSB or S in HSL.
Edit > Fill
- Use: White, Black, or 50% Grey
- Mode: Saturation
You will be left with Photoshop's flavor of Luminosity.
Putting it together, my Layer palette looks something like this:
Extracted Luminosity set to Luminosity blending mode
Extracted Saturation set to Saturation blending mode
Extracted Hue set to Normal blending mode or Hue
With basic tweaks:
-- adjustment layer clipped to Lum
-- adjustment layer clipped to Sat
-- adjustment layer clipped to Hue
When I'm looking to fix a photo, I always go through most of that. Sometimes all I need is a little hue shift and a little bit of sat tweakage. Sometimes it's just lum and sat. Other times, by looking at these 'channels', I'll get a better plan of attack using other tools.
As you can see, extracting HS/Lum is relatively simple. Shouldn't take much to record an Action. Personally, I wrote my own PC/Win plugs to do it for me with some extra options.
That is the very basic technique. If you get to playing with it and expounding on the ideas, you just might be surprised. The acrobatics that can be done with this never cease to amaze me.
That is where my flow starts. If you take a piece of it, cool. If not, that's cool, too.
I am working on a rather large series of tutorials that will get into the serious nitty-gritty of it.
I'm not sure what to say about my goose pimply idea. Kind of hard to explain.
You will be able to modify any two 'channels' with any two values much in the same way that Displace works.
Imagine something like this:
if (hue = red & sat = medium)
the (hue = magenta & sat = low)
It gets *much* better than that, but that's where I'm going to leave it for now.
Last edited by Stroker; 02-27-2005 at 01:28 PM.
In any case, that is why I almost always work by the numbers because often I don't trust my eyes either.
So, when you have an image with "known" black, white and even better greys points, you balance the numbers to eliminate the cast. I'm sure you understand that. With your picture that's harder to do but for skin tones there's plenty written about skin tone values. Work to the values, 20 to 33% more yellow than magenta. Adding more Cyan gives more of a tanned look. Tweaking is by definition, minor adjustments that are made to suit your own personal taste. Also, don't forget that Sharpening your image and increasing/decreasing the RGB curve can give your image a very different and powerful look. Sorry, I'm starting to rant!
Last edited by Duv; 02-27-2005 at 02:11 PM.
Argh! So much fun!
Finally understood what you're up to. (If you look at my tutorials, they're weird too) And I won't have time to look at it again until Thursday! I wonder what activity will be down-prioritized... work?
I guess you're one hour behind me, and it's bedtime here already
Best part here:
What an interesting Thread and even more interesting methods!!!! Thanks for sharing!!!
I had posted my version of your Image, but after reading and trying Kisa's tip I removed it and here is what I came up with.
I don't know how this will look like on the differently calibrated monitors .... but on mine it looks quite nice and, what more, I got there with a few very simple steps:
1) Kiska's excellent tip about Image>Adjustment>Match Color.... thanks again for it!!!! (values in Attachment 2)
...This gave me the basis for the next steps. (Attachment 3)
2) Selective Color Adjustment Layer. (Values in Attachment 4)
3) Brightness & Contrast Ajustment Layer (Brightness = +43; Contrast = +21), Ctrl+I inverted it's Layer Mask and with a soft white Brush (Opacity 50-80%) painted over Lene's eyes to brighten them up a bit.
4) Merged Visible (the action for merging 'visible' without losing the underlying 'steps' can be downloaded here.)
5) USM to ligthly sharpen the image and improve contrast.
My Layers Palette in Attachment 5.
Just change the values in each Adjustment Layer until you are satisfied with the result....
Flora, wow(jaw drop) it looks very vivid. I like it very much.
Stroker, you made me happy to study sort of math(including D-Map in PS) .
I've followed your tutorial and found it very interesting! Thanks a lot.
I will almost always correct an image separately Luminosity / Colour.
(This thread is getting really interesting)
Also in this case I would not have needed fancy colour separation, but I am pretty sure that I would have found the same effect on correctly exposed shots (will check - have several), given what I know about the light in that room. I think I finally may be on the road to a technique I can correct my favourite portrait, one that has been lying around for 1.5 years...
(And if anyone wonders, yes I have the time to post, but not play with Photoshop!)
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