RDO GPU texture encoders increase the number/density of LZ matches in the encoded output texture. He's a file entropy visualization of kodim18.dds. The left image was non-RDO encoded, the right image was encoded with lambda=4.0 max backwards scan=2048 bytes.
RDO, one byte matches removed:
"The output is fv.bmp with the given size in pixels, which visually displays where matching substrings of various lengths and offsets are found. A pixel at x, y is (black, red, green, blue) if the last matching substring of length (1, 2, 4, 8) at x occurred y bytes ago. x and y are scaled so that the image dimensions match the file length. The y axis is scaled log base 10."Tool source: