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Photo Retouching "Improving" photos, post-production, correction, etc.

Yellow/red cast

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Old 09-13-2006, 10:17 AM
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Flora Flora is offline
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Originally Posted by Christo
The attached image has been critiqued by one side as having too much yellow, the other too much red.
... and, in my opinion, a bit too much magenta as well...

I used:

Selective Colors
Blank Layer set to Color (for the green cast on the jacket and on the top of the hair)
Levels to improve contrast.


I think you toned down the colours very well ... but, in my opinion, using a "a blank layer set to Color blend mode ... " as only colouring method on the face, or skin in general, can result in a rather flat colour...


extracted from PS Help file

The Lab Color mode has:
a lightness component (L)
the (a) component (green-red axis)
the (b) component (blue-yellow axis)
You can use Lab mode to:
edit the luminance and the color values in an image independently, move images between systems......

Lab color is the intermediate color model Photoshop uses when converting from one color mode to another.
Great job everybody!!!
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Old 09-13-2006, 10:20 AM
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Flora Flora is offline
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OOOpppssss ....

Sorry Phil ... I hadn't seen you had answered about the LAB mode already...
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Old 09-13-2006, 01:44 PM
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LonK LonK is offline
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I suppose I did pretty much what Flora did, the biggest difference being that I use PhotoImpact.
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Old 09-13-2006, 07:28 PM
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Daviskw Daviskw is offline
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Hi all... good job as usual... I have nothing new to offer. Selective color and hue/saturation here as well.

I had saved it to the drive so posting

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Old 09-13-2006, 09:35 PM
dkcoats dkcoats is offline
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Flora, you never cease to amaze me.

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Old 09-14-2006, 01:48 AM
Angel_Ice Angel_Ice is offline
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Originally Posted by philbach
Hi Angel Ice.
Lab mode is a different way of expressing color. We usually use RGB Mode for most of our work (Red, Green, &Blue) or CYMK Mode which is used for printing. Lab uses Lightnes and A & B channels. Before using Lab mode though its a good idea to have a good understanding of RGB and photoshop.

The advantage of Lab is that one can alter color without affecting luminosity or vice versa.

I am not a LAB expert. I read Dan Margulis "Photoshop Lab Color" last fall for the first time and I plan on reading it again this fall too. Its an excellent book, but for me I need to read it a few times to understand it better.

Thanks so much for this explanation, it's more understable for me that the one found in the Adobe Help file; thanks Flora for coping and pasting the Adobe Help but i have red it before and it was not clear for me.

Do you have some exemple of this technique or i'm going OT here?
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Old 09-14-2006, 05:25 AM
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philbach philbach is offline
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Using Lab

Well using the above photo; open it in photoshop and then convert from RGB to LAB mode. In lab open up a curves adjustment layer. When the curves dialog box comes up I started with the A channel (Magenta and Green). I then rotated the diagonal line clockwise to desaturate the Magenta and greens. After doing this go to the b channel to desaturate the Blue and Yellow.

Again there are other ways of dealing with oversaturation. Using Lab is an excellent way to deal with color problems. I wish I knew more about using it.
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