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How to quickly create a bump map in Photoshop

Open your texture.
Select Image - Mode - Grayscale. Select Discard.

01 textured metal plate.jpg

Then select Image - Adjustments and click Brightness/Contrast.

Adjust the brightness and contrast to produce the maximum contrast in your image.

The settings will depend on your image.
02 brightess and contrast adjustment in Photoshop.jpg

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