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RLE is an old technique being used for decades, as is known as Run-Length-Encoding, which means that for repeating sequence of bytes, we keep an indicator for the length of the sequence and only one sample of it, to save storage space. GIMP can generate lossless-compressed TGA images, with RLE compression being used. It means that for a compressed image, the data is no longer arranged in sequence of pixels, but a sequence of pixel packets. There are two possible pixel packets: - RLE packets, which are encoded with one byte for indicating the run-length and another one pixel (3 bytes for TrueColor pixel), so essentially in runtime, the TGA decoder will use the length to plot the same pixel in multiple pixels of the output pixel bitmap. - Raw packets, which are encoded with one byte as indicator for the length of the whole pixel sequence and N-length pixel sequence afterwards. This is not used for any sort of compression by the TGA format, but still needed to be supported for full compatibility with TGA images that uses the RLE compression. |
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