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Asked: May 11, 20262026-05-11T09:45:15+00:00 2026-05-11T09:45:15+00:00

How do I change the global alpha value of a BufferedImage in Java? (I.E.

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How do I change the global alpha value of a BufferedImage in Java? (I.E. make every pixel in the image that has a alpha value of 100 have a alpha value of 80)

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  1. 2026-05-11T09:45:16+00:00Added an answer on May 11, 2026 at 9:45 am

    I don’t believe there’s a single simple command to do this. A few options:

    • copy into another image with an AlphaComposite specified (downside: not converted in place)
    • directly manipulate the raster (downside: can lead to unmanaged images)
    • use a filter or BufferedImageOp

    The first is the simplest to implement, IMO.

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