RLE4 coding scheme:
Within a run two colour indices are stored together in a byte value. If direct repititions of a single index appear, both the lower and the most significant 4 bits of the run value has to be identical. The run counter relates to the number of pixels and not to the entire byte.
encoded decoded 01 0F 0 02 0F 0 F 03 0F 0 F 0 04 0F 0 F 0 F 04 00 0 0 0 0
As defined for 8 bit RLE, the coding in absolute mode has to be extended to word boundaries too:
encoded decoded 00 03 12 30 1 2 3 00 04 12 34 1 2 3 4 00 05 12 34 50 00 1 2 3 4 5 00 06 12 34 56 00 1 2 3 4 5 6 00 07 12 34 56 70 1 2 3 4 5 6 7 00 08 12 34 56 78 1 2 3 4 5 6 7 8
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