The Encoder module defines various constants that control how various image formats are saved.
Constants
| BMP_DEFAULT | = | 0x0 | ||
| BMP_SAVE_RLE | = | 0x1 | ||
| EXR_B44 | = | 0x0020 |
Save with lossy 44% float compression - goes to 22% when combined with EXR_LC |
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| EXR_DEFAULT | = | 0x0 |
Save data as half with piz-based wavelet compression |
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| EXR_FLOAT | = | 0x0001 |
Save data as float instead of as half (not recommended) |
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| EXR_LC | = | 0x0040 |
Save images with one luminance and two chroma channels, rather than as RGB (lossy compression) |
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| EXR_NONE | = | 0x0002 |
Save with no compression |
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| EXR_PIZ | = | 0x0008 |
Save with piz-based wavelet compression |
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| EXR_PXR24 | = | 0x0010 |
Save with lossy 24-bit float compression |
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| EXR_ZIP | = | 0x0004 |
Save with zlib compression, in blocks of 16 scan lines |
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| J2K_DEFAULT | = | 0x0 |
Save with a 16:1 rate |
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| JP2_DEFAULT | = | 0x0 |
Save with a 16:1 rate |
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| JPEG_BASELINE | = | 0x40000 |
Save basic JPEG, without metadata or any markers |
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| JPEG_DEFAULT | = | 0x0 |
Loading (see JPEG_FAST); saving (see JPEG_QUALITYGOOD|JPEG_SUBSAMPLING_420) |
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| JPEG_OPTIMIZE | = | 0x20000 |
On saving, compute optimal Huffman coding tables (can reduce a few percent of file size) |
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| JPEG_PROGRESSIVE | = | 0x2000 |
Save as a progressive-JPEG (use | to combine with other save flags) |
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| JPEG_QUALITYAVERAGE | = | 0x0400 |
Save with average quality (25:1) |
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| JPEG_QUALITYBAD | = | 0x0800 |
Save with bad quality (10:1) |
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| JPEG_QUALITYGOOD | = | 0x0100 |
Save with good quality (75:1) |
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| JPEG_QUALITYNORMAL | = | 0x0200 |
Save with normal quality (50:1) |
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| JPEG_QUALITYSUPERB | = | 0x80 |
Save with superb quality (100:1) |
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| JPEG_SUBSAMPLING_411 | = | 0x1000 |
Save with high 4x1 chroma subsampling (4:1:1) |
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| JPEG_SUBSAMPLING_420 | = | 0x4000 |
Save with medium 2x2 medium chroma subsampling (4:2:0) - default value |
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| JPEG_SUBSAMPLING_422 | = | 0x8000 |
Save with low 2x1 chroma subsampling (4:2:2) |
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| JPEG_SUBSAMPLING_444 | = | 0x10000 |
Save with no chroma subsampling (4:4:4) |
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| PNG_DEFAULT | = | 0x0 | ||
| PNG_INTERLACED | = | 0x0200 |
Save using Adam7 interlacing (use | to combine with other save flags) |
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| PNG_Z_BEST_COMPRESSION | = | 0x0009 |
Save using ZLib level 9 compression flag (default value is 6) |
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| PNG_Z_BEST_SPEED | = | 0x0001 |
Save using ZLib level 1 compression flag (default value is 6) |
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| PNG_Z_DEFAULT_COMPRESSION | = | 0x0006 |
Save using ZLib level 6 compression flag (default recommended value) |
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| PNG_Z_NO_COMPRESSION | = | 0x0100 |
Save without ZLib compression |
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| PNM_DEFAULT | = | 0x0 | ||
| PNM_SAVE_ASCII | = | 0x1 |
If set the writer saves in ASCII format (i.e. P1, P2 or P3) |
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| PNM_SAVE_RAW | = | 0x0 |
If set the writer saves in RAW format (i.e. P4, P5 or P6) |
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| TARGA_DEFAULT | = | 0x0 | ||
| TARGA_SAVE_RLE | = | 0x2 |
If set, the writer saves with RLE compression |
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| TIFF_ADOBE_DEFLATE | = | 0x0400 |
Save using ADOBE DEFLATE compression |
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| TIFF_CCITTFAX3 | = | 0x1000 |
Save using CCITT Group 3 fax encoding |
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| TIFF_CCITTFAX4 | = | 0x2000 |
Save using CCITT Group 4 fax encoding |
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| TIFF_CMYK | = | 0x0001 |
Reads/stores tags for separated CMYK (use | to combine with compression flags) |
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| TIFF_DEFAULT | = | 0x0 | ||
| TIFF_DEFLATE | = | 0x0200 |
Save using DEFLATE compression (a.k.a. ZLIB compression) |
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| TIFF_JPEG | = | 0x8000 |
Save using JPEG compression |
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| TIFF_LOGLUV | = | 0x10000 |
Save using LogLuv compression |
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| TIFF_LZW | = | 0x4000 |
Save using LZW compression |
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| TIFF_NONE | = | 0x0800 |
Save without any compression |
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| TIFF_PACKBITS | = | 0x0100 |
Save using PACKBITS compression |