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Editorial Team
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Asked: 2026-05-25T22:22:07+00:00

I’m trying to mark pixels as transparent when encoding rgb data to 8-bit png

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I’m trying to mark pixels as transparent when encoding rgb data to 8-bit png image (palette) using libpng. If I create a separate alpha channel in this case, the alpha channel is getting ignored. Is there a way to set the pixels as opaque or transparent when using 8-bit color palette ?

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1 Answer

  1. Editorial Team

    To mark some palette index(es) as transparent, you must create a tRNS chunk.
    In libpng, I guess you must use the function png_set_tRNS()

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