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Chapter 8. Color Correction > Use Gray to Fix Color?!?

Use Gray to Fix Color?!?

Do you remember how to make gray in RGB mode? Equal amounts of red, green, and blue, right? Let's open an image and see if we can find an area that should be gray. Then we can look in the Info palette to see if it really is gray in Photoshop—all without trusting your monitor or eyes! Open the image on the CD that's called “make gray.jpg.” The wall behind the firefighting equipment should be gray. If the RGB numbers in the Info palette aren't equal—no matter what it looks like on your monitor—it's not gray. If it's not gray, then it must be contaminated with color (Figure 8.24). But would that color contaminate only the gray area? I doubt it. Then why not use the wall as an area to measure what's wrong with the entire image, so we can fix it? Let's give it a try.

Figure 8.24. If the RGB numbers are not equal, then that area is not gray.



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