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11:19 PM
Some file formats like BMP or TGA (often) have predictable file layouts. GPU-compressed formats in particular are designed so that if you know what part of the image you want to read, you can immediately jump to the exact bytes that matter, skipping over the rest.
But common file formats in more everyday use, like JPEG or PNG, don't have this property. The exact byte offset of a particular pixel can depend on how well the pixels before it in the file managed to compress. If the data before it was very compressible, it might move earlier in the file. If the compressor wasn't able to reduce the preceding data much or at all, it might move later.
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