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.
Note, some image formats, such as JPEG, reserve an optional integer range for setting the quality level. For example, to save a progressive JPEG with a quality of 90 (out of 100), you’d use the following flag 90 | JPEG_PROGRESSIVE. For more information, refer to the FreeImage documentation: freeimage.sourceforge.net/documentation.html.
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