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Useful photoshop information.
Updated on Feb 03, 10
Created on Jul 17, 09
Category: Collecting & Hobbies
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Dyi Kinney's List: Photoshop Stuff
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Jul 18, 09
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A quick and dirty way to correct for a color cast is to think like the photographer. If you shot under fluorescent lighting without a filter, add a filter in photoshop. It is easier than using any adjustment layer such as HSV or Curves. Take the eye dropper from the tool palette (make sure your sample size is 3x3 or 5x5) and choose an area of the images that you feel SHOULD be middle gray . Choose that color. Your foreground color has now changed to your choice. Next step is to make a new layer and go to Edit>Fill...>Foreground Color. This step just filled the new layer with the color you are trying to get rid of. Be patient. Next go to Image>Adjust>Invert. (This will change the layer filled with the color you are trying to remove to its opposite). This next step is the most critical. You have to change the layer mode to Color AND change the opacity of the layer to 50%. When you change to Color mode, you will get (for this example) a magenta cast over the whole image. When you change to 50%, the cast will be almost, if not all, gone. This is why you have to choose an area that would be middle gray. Your added layer should now correct for most of the color cast. Play with the % to your liking. You can do this for images that have multiple types of lighting just using a layer mask on the layers of color you are trying to correct. Basically you added a magenta filter. I learned this technque in NYC at Photo Expo Plus in early November from a very talented individual whose seminar I attended but can't remember her name.
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