I have thousands of images and in about 75% of the old ones, fleshtones are yellow instead of pink. Now, I can change that but it changes the entire image to a degree that makes it look unreal. So, my question would be, is there a way to CHOOSE the color that one wishes to modify and then modify ONLY that color?
I recommend either the
Selective Color or the
Hue/Saturation tool. Go under
Image —> Adjust —> and choose one or the other.
Selective Color is pretty self-explanatory: Choose a color in the top field, then add (or subtract) desired amounts of any of the 4 colors shown until the preview looks like you want. ("Relative" is more natural-looking; "Absolute" is more precise.)
Hue/Saturation: The dialog box will have several fields:
Edit (a drop-down menu with a choice of color channels),
Hue (literally, what color something is),
Saturation (how vivid or subdued it is, like the "Color" setting on your TV), and
Lightness (Don't use this too much; it will "grey out" your shadows).
Under
Edit, choose "Yellows". (To see whether you and Photoshop agree on which pixels are yellow, grab the
Saturation bar and drag it way to the right — those pixels should brighten way up. Then return that slider to "0".)
Move the
Hue slider slightly to the left. It will make the yellows in your image lean a little toward red. If Photoshop thinks the pixels in question are more red, then choose "Reds" under Edit, move the
Hue slider to the left, which will make your reds lean toward Magenta.
Both of the above methods will correct only the chosen colors in your image.