Using the Invert and Equalize Commands
The Invert command reverses the colors and tonal values to their opposite values; in effect creating a negative. The Equalize command exaggerates the contrast between similar color values. It's useful in finding stray pixels in a seemingly solid color area, or for a special color effect.
Use the Invert Command
Open an image.
Click the Image menu, point to Adjustments , and then click Invert .The brightness values of each image channel are reversed, creating a negative color or grayscale image.[View full size image]
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Use the Equalize Command
Open an image.
Click the Image menu, point to Adjustments , and then click Equalize .The brightness values of the image pixels are distributed in a way that more accurately represents the entire range of brightness levels from white to black.[View full size image]
[View full size image]