T.87 : Lossless and near-lossless compression of continuous-tone still images - Baseline


The images included in this package constitute the data set used for implementing the JPEG-LS conformance test as described in Section 8 and Annex E of the JPEG-LS standard document ITU-T Rec. T.87|ISO/IEC 14495-1
Uncompressed test images images are in either PGM (grayscale) or PPM (3-color) format. This is of course NOT part of the JPEG-LS standard. For more information on both formats, check the following link Readme Images included in the software provided with the recommandation.

Compression process | Decompression process

Compression Testing Table

File Size before compressing Compression used Size after compressing
TEST8.PPM 193 KB Lossless 99 KB
TEST8.PPM 193 KB Near-Lossless 62 KB
TEST8R.PPM 65 KB Lossless 33 KB
TEST8R.PPM 65 KB Near-Lossless 21 KB
TEST8G.PPM 65 KB Lossless 34 KB
TEST8G.PPM 65 KB Near-Lossless 21 KB

Decompression Testing Table

Input File Size before decompressing Decompression used Output File(s) Sizes after decompressing (respectively)
T8C0E0.JLS 100 KB Lossless locod1.out; locod2.out; locod3.out 65; 65; 65 KB
T8C0E3.JLS 63 KB Near-Lossless nlocod1.out; nlocod2.out; nlocod3.out 65; 65; 65 KB
T8C1E0.JLS 99 KB Lossless locod1.out; locod2.out; locod3.out 65; 65; 65 KB
T8C1E3.JLS 62 KB Near-Lossless nlocod1.out; nlocod2.out; nlocod3.out 65; 65; 65 KB
T8C2E0.JLS 98 KB Lossless locod.out 193 KB
T8C2E3.JLS 61 KB Near-Lossless nlocod.out 193 KB
T16E0.JLS 59 KB Lossless loco16d1.out 129 KB
T16E3.JLS 42 KB Near-Lossless nloco16d1.out 129 KB