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