1 Choose Image > Adjustments > Gamma.
2 Select Preview to preview the adjustment in the image.
3 Adjust the gamma:
• Select Windows to Macintosh to adjust gamma for display in Mac OS.
• Select Macintosh to Windows to adjust gamma for display in Windows.
Note: Images created in Photoshop 4.0 or earlier use Mac OS gamma value (1.8) by default and should be adjusted for display in Windows (unless gamma was adjusted when the image was created). Images created in Photoshop 5.0 or later use Windows gamma value (2.2) by default and will be at the correct gamma for display in Windows with no adjustment.
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