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help w/ this image: removing color cast

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Old 09-14-2009, 08:21 AM
mistermonday's Avatar
mistermonday mistermonday is offline
Join Date: Dec 2005
Posts: 3,028
Re: help w/ this image: removing color cast

Doug, you are welcome.
I hope the following example will help better explain the process.
Attachment 1 is a photo of Prince Harry having a bit of a bad skin day. On the surfact this may look like a challenge because there is red in his hair and there is red in his face and lots of strong red in his cheeks plus that lone big red splotch on his forehead. Some of Photoshops tools will pose a challenge when trying to select and fix the anomalous areas. So let's use the Hue/Sat adjustment layer.

1. Add a Hue/Sat adj layer and select the Red channel. Drag the Saturation slider to the far left. Notice that the whole image is affected (no screenshot, but try it). Adjusting the Hue and Sat levels will impact the whole image and not get us to where we need to be. So what we need to do is the same as with the Dog photo. This time select the Red channel and drag those triangles together. Drag the Sat slider all the way to the left. If ou see any gray in the image just nudge the merged triangles over a little to the left or right until the gray completely disappears.
Now once again slect the + eyedropper and touch the redest part of Harry's cheeks and the bright red in his ear. After 2 or 3 clicks you should end up with screenshot 1 attached. (Dragging the saturation slider to the left just provides us with a visual guide so we can see what pixels are affected by the eyedropper.
Closing the triangles basically reduces the starting slection range to 0. So there are really no reds selected until you do so with the eyedropper. Moreover you are controlling the selection to a very tight range and so you are tightly controlling the colors that you will finally adjust.
BTW, the lips will lose color but don't worry about that for now.

2. OK, now you have isolated the strong red. Move the saturation slider back to the center (0). Drag the Hue slider toward th right to move the selected color from red toward yellow. I stopped at +12, but it is up to your taste. See screenshot 2.

3. This is where you usually click OK. However, I found that the image overall was a little too saturated. So I pulled down the channel window and selected the Master channel and lowered the saturation. See Screenshot 3. Now press OK.

4. When you are done, there may be an unavoidable casualty - the lips. Now we are going to fix it using a similar technique as we did last time with the layer mask. This image is different form the dog image in that we only need to fix the lips. So with the mask layer still active (and the square icon still white) take a black soft brush and paint over the lips- and your are done.

Are you are wondering why on the dog image we inverted the layer mask and painted with white? It really has to do with how much painting you want to do. With the dog image a lot of green everywhere else in the image was affected by the Hue Sat adj layer. Rather than painting it all black, it was faster to invert the mask, and just paint the legs with a white brush. For this image everything is ok except for the lips. So leave the mask white and just mask over the lips.
Attached Images
File Type: jpg Prince Harry Red Face.jpg (128.2 KB, 83 views)
File Type: jpg Prince Harry Screenshot 1.jpg (157.8 KB, 81 views)
File Type: jpg Prince Harry Screenshot 2.jpg (156.6 KB, 79 views)
File Type: jpg Prince Harry Screenshot 3.jpg (155.5 KB, 85 views)
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Old 09-14-2009, 08:49 AM
MiningArt's Avatar
MiningArt MiningArt is offline
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Join Date: Jun 2009
Location: United States
Posts: 792
Re: help w/ this image: removing color cast

Thanks for the detailed explanations in this post.
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Old 09-17-2009, 05:19 PM
BobZZZ BobZZZ is offline
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Join Date: Jul 2007
Posts: 14
Re: help w/ this image: removing color cast

I used brute force. Duplicate layer make rough rectangular selection of green flare. ctl m to bring up curves Click a point on the green bit of the dogs leg to fix a point in each channel. The dogs foot is around 60 in RG&B so lift each point to get that sort of reading and jiggle till leg looks ok.

Then ctl d to deselect add layer mask paint white with soft brush 30% to reveal.

Still a bit low on contrast so dup top layer set to multiply and adjust opacity.

Last off the entire image has a green cast to my mind so curves adjustment layer on top and lighten the green channel a touch.
Attached Images
File Type: jpg dog.jpg (97.0 KB, 36 views)
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