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I want to invert the green channel for my normal map texture (for use in a program which uses different handedness from the program that generated it). How do I do that using Photoshop preferably (or any other freeware program)? I believe CTRL + I or "Layer -> New Adjustment Layer -> Invert" inverts the color of all channels in the image. Help will be appreciated. Thanks in advance.

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Open Window > Channels

Select the Green channel and press CTRL + I to invert

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