Original ( but converted to JPEG)
'Lena' has been one of the standard test images used in computer graphics for quite a number of years, and has an interesting history . For those of a curious nature, the original source data was obtained from this site .
The uncompressed raw image would occupy either 512kb at 16bpp, or 768kb
at 24bpp.
Compression Results:
Equal Resolution (512x512)
8 Bit palettised Size: 256k (+ 0.75k table) RMS error: 10.4 |
4 Bit palettised Size: 128k (+ 0.05k table) RMS error: 22.8 |
DXTC Size: 128k Per channel RMS Error: 7.5 |
2x2 VQ Size: 64k (+ 2k table) Per channel RMS Error: 12.1 (For interest, this is a Pseudo Colour Image showing VQ code book usage) |
Equal Storage Space (approx 64k)
Since the 4 bit palettised mode is so bad with this test example, it
has subsequently been ignored.
Basic 24 bpp texture Initial Resolution: 148x148 RMS Error: 38 |
8 Bit palettised Initial Resolution: 256x256 RMS Error: 34.9 |
DXT1 Initial Resolution: 364x364 RMS Error: 32.4 |
2x2 VQ Resolution: 512x512 RMS Error: 12.1 |