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Thread started 25 Dec 2015 (Friday) 03:24
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Color separation using Photoshop

 
ccp900
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Post edited over 3 years ago by ccp900.
     
Dec 25, 2015 03:24 |  #1

Hi there

Does anyone have any good reference in how to enhance or improve color separation (specially for like colors like leaves and vegetation) in an image using photoshop - curves, etc.

I know LAB can do this quickly, but what is the equivalent in RGB? Do i need to color pick each color range i want to edit and then do a curves adjustment and then mask out everything else (color range does this anyway)?

thanks


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ThreeHounds
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Dec 25, 2015 08:00 |  #2

Luminosity masking works well for this kind of work. Search for Tony Kuyper, he has a lot of good tutorials on this.


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ccp900
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Dec 25, 2015 08:33 |  #3

ThreeHounds wrote in post #17831899 (external link)
Luminosity masking works well for this kind of work. Search for Tony Kuyper, he has a lot of good tutorials on this.

There are saturation masks now as well so ill read up on that too but if anyone has tips on color separation and variation then im all ears....


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ThreeHounds
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Dec 25, 2015 09:31 as a reply to  @ ccp900's post |  #4

TK also shows how to mask based on colors... different luminance of each of the RGB channels, 10 levels of each channel. I do much of what you ask in my landscapes using this method.


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ccp900
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Dec 25, 2015 10:42 |  #5

ThreeHounds wrote in post #17831946 (external link)
TK also shows how to mask based on colors... different luminance of each of the RGB channels, 10 levels of each channel. I do much of what you ask in my landscapes using this method.

thanks 3hounds


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kjonnnn
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Post edited over 3 years ago by kjonnnn.
     
Dec 27, 2015 13:24 |  #6

Also, try using a Black and White Adjustment layer, with Layer Blend set to Luminosity. You adjust individual colors.




  
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chauncey
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Dec 28, 2015 15:00 |  #7

Also, try using an Black and White Adjustment layer, with Layer Blend set to Luminosity. You adjust individual colors.

FWIW...using that technique, once you crank up an individual color and then increase it's saturation,
you can then use the color range command to make a selection of that color.


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ccp900
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Dec 30, 2015 09:20 |  #8

hmmm...cool ideas...thanks guys


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kirkt
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Dec 30, 2015 11:01 |  #9

If you are trying to increase color contrast by moving similar colors apart in a perceptually natural way you can, as you say, use Lab curves. Just curious why you are not using this simple, effective method? You can make an action that converts from your RGB space to Lab, applies the a and b curves and converts back to RGB, no muss no fuss. Try it on something that has a lot of similar colors, like a brick wall, to tune the effect to the look you want. You can also experiment with curving the a and b channels differently from each other to emphasize color contrast in specific color ranges.

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ccp900
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Jan 13, 2016 13:42 |  #10

kirkt wrote in post #17837592 (external link)
If you are trying to increase color contrast by moving similar colors apart in a perceptually natural way you can, as you say, use Lab curves. Just curious why you are not using this simple, effective method? You can make an action that converts from your RGB space to Lab, applies the a and b curves and converts back to RGB, no muss no fuss. Try it on something that has a lot of similar colors, like a brick wall, to tune the effect to the look you want. You can also experiment with curving the a and b channels differently from each other to emphasize color contrast in specific color ranges.

kirk

Thanks Kirk! Just thinking of other ways it can be done..new techniques to play around with.


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kirkt
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Jan 13, 2016 16:28 as a reply to  @ ccp900's post |  #11

You may be interested in Dan Margulis' book about he Picture Postcard Workflow (PPW). Again, much of what he describes is implemented in Lab, but the theory and motivation for each technique might be useful to your thought process. The PPW concepts are also available as a PS panel that runs very complex actions implementing the various steps of the workflow.

See:

https://www.ledet.com/​margulis/ppw (external link)

The book that describes all of this is well worth the read - it will take several (I mean SEVERAL) passes just to get through it once.

kirk


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Vitoflo
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Feb 02, 2017 02:27 |  #12

You can try using a Solid Color Adjustment layer (gray 50%) blended in Luminosity mode and will get only the color (hue + saturation) map of the image.

Also, you can try using a Solid Color Adjustment layer (gray 50%) blended in Color mode and will get only the luminosity map of the image.




  
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Color separation using Photoshop
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