| Value | Meaning |
|---|---|
| UndefinedCompression | |
| NoCompression | The default for most formats. |
| BZipCompression | BZip (Burrows-Wheeler block-sorting text compression algorithm and Huffman coding) as used by bzip2 utilities |
| DXT1Compression | |
| DXT3Compression | |
| DXT5Compression | |
| FaxCompression | CCITT Group 3 FAX compression. |
| Group4Compression | CCITT Group 4 FAX compression (used only for TIFF). |
| JPEGCompression | JPEG compression. See_Also: The JPEG image compression FAQ. |
| JPEG2000Compression | JPEG2000 compression for compressed PDF images. ISO/IEC std 15444-1 |
| LosslessJPEGCompression | |
| LZWCompression | Lempel-Ziv-Welch (LZW) compression. |
| RLECompression | Run-length encoding. See_Also: Wikipedia. |
| ZipCompression | Lempel-Ziv compression (LZ77) as used in PKZIP and GNU gzip. |
| ZipSCompression | |
| PizCompression | |
| Pxr24Compression | |
| B44Compression | |
| B44ACompression | |
| LZMACompression | Lempel-Ziv-Markov chain algorithm |
| JBIG1Compression | ISO/IEC std 11544 / ITU-T rec T.82 |
| JBIG2Compression | ISO/IEC std 14492 / ITU-T rec T.88 |
Express the desired compression type when encoding an image. Be aware that most image types only support a sub-set of the available compression types. If the compression type specified is incompatible with the image, ImageMagick selects a compression type compatible with the image type.