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How to convert a 32 bit(A8R8G8B8) image(.bmp uncompressed /or .png) with alpha channel into .bmp RLE compressed with alpha channel using Gimp or ImageMagic or any other open source tool?

Thanks, Sridhar

  • RLE only works with 256 colors (from what I've read). I tried ImageMagick's convert and it lead to the same result, no matter what compression I use (none or RLE). Both files are exactly the same size. (BMP -> "compressed" BMP). Stick with PNG whenever possible, it yields smaller files. – GiantTree Jul 17 '15 at 20:37
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    @Steven: Tried both Gimp and ImageMagic. I could convert 32 bit .png into 32bit .bpm (without losing alpha channel). But I couldn't apply any compression if the image has alpha channel. – SridharKritha Jul 19 '15 at 16:15
  • In Gimp there is an option for to change the image into indexed mode. After that mode change you could apply RLE but you will lose the alpha channel. – SridharKritha Jul 19 '15 at 16:22

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