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    <p>If you're guaranteed that it's an uncompressed 24bpp bitmap and its width is divisible by 4, it's relatively simple:</p> <ol> <li>Read a <code>BmpHeader</code> at the start of the file.</li> <li>Without seeking, read a <code>BmpImageInfo</code>.</li> <li>Seek to the <code>BmpHeader</code>'s <code>offset</code> bytes from <em>the beginning of the file</em>. Note that there is no palette (at least, not one we care about) in 24-bit bitmaps!</li> <li>Read BGR triplets (in that order, and there's no <code>reserved</code> unused member here). There will be (<code>BmpImageInfo</code>'s members) <code>width * abs(height)</code> triplets. As I recall, if <code>height</code> is positive (the standard case), the first line of color you read will be the <em>bottom</em> line of the image, going up from there. If <code>height</code> is negative, though, the first line of color in the file is the <em>top</em> of the image, going down from there.</li> </ol> <p>If you can't make those guarantees, then things get a good deal more complicated.</p> <p><strong>Disclaimer: I'm gratuitously tooting my own horn here.</strong> Years ago I wrote a tiny (one source file) utility to do exactly what you're talking about, in a portable (100% ANSI C) way: <del>glbmp</del> <a href="https://github.com/chazomaticus/libbmpread" rel="nofollow noreferrer">libbmpread</a>. Its source might shed some light on your problem--it handles uncompresed (no RLE) bitmaps of any bit depth, and should run fine on a GBA.</p>
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    1. POGetting RGB values for each pixel from a 24bpp Bitmap for conversion to GBA format in C
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    1. COhey thanks for pointing me in the right direction, i'll have a look and test the tool tomorrow :D . Also i found in handy svens post also, just that indeed on the ds/gba it reads the RGB backwards -> BGR, so i still have a little thing to do but i hope to make it work . thanks again .
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    2. COglbmp has moved to [github](https://github.com/chazomaticus/libbmpread). Brought a smile to my face; I'd thought that the days of tiny, fast C were long gone.
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      1. USCamille Goudeseune
    3. COCamille, I'll update the question with the new link. Thanks!
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