Adjusting the gamma value of an image (Image Ready)

Gamma measures the brightness of midtone values produced by a device (often a monitor). A higher gamma value yields an overall darker image. Windows systems use a higher gamma value than Mac OS systems, with the result that the same image is noticeably darker on a Windows system than on a Mac OS system.

Image with Windows gamma and Mac OS gamma

Designers, particularly those who use Mac OS systems to create images that will be viewed primarily on Windows systems, must consider the issue of cross-platform gamma. You can modify the gamma value of an image to compensate for the differences between Windows and Mac OS monitors.

Note: The Gamma dialog box modifies the pixel values in an image. By contrast, the View > Preview commands adjust the appearance of the image on your monitor but do not change the image's pixel values.

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