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Changes the color and contrast of the bitmap you are tracing.
The Adjust Image Colors command lets you adjust the colors, brightness, white level, and contrast of the image you have loaded for tracing. Changing these settings can make it easier to trace an image, especially if it does not have a lot of contrast.
Adjusting the image colors does not affect the image file. It only affects the appearance of the image in LAYOUT, and only after you click OK.
The Adjust Image Colors dialog