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enumIGISISCompressions
API Reference Guide > ISIS Component API Reference > ISIS Component Enumerations Reference > enumIGISISCompressions

These are all the possible values for the IG_ISIS_TAG_COMPRESSION tag.

Values:

IG_ISIS_COMPRESSION_NONE No compression, each line is packed to one byte.
IG_ISIS_COMPRESSION_MG3 Modified (no EOL) CCITT Group 3 1-Dimensional Huffman run-length encoding, each line starts on a new byte.
IG_ISIS_COMPRESSION_G3 Standard CCITT Group 3 coding, 1 Dimensional Huffman run-length encoding.
IG_ISIS_COMPRESSION_G4 Standard CCITT Group 4 encoding.
IG_ISIS_COMPRESSION_LZW LZW coding as described in the TIFF specification.
IG_ISIS_COMPRESSION_JPEG JPEG coding typically used for grayscale and color only.
IG_ISIS_COMPRESSION_PACK Packbits compression.
IG_ISIS_COMPRESSION_32771 No compression, each line padded to two bytes.
IG_ISIS_COMPRESSION_JBIG JBIG compression.
IG_ISIS_COMPRESSION_PCX Compression scheme used in PCX files.
IG_ISIS_COMPRESSION_4BYTE No compression, each line padded to four bytes.
IG_ISIS_COMPRESSION_RUN Runlist compression; internal use only.
IG_ISIS_COMPRESSION_GIF Compression scheme used in GIF files.
IG_ISIS_COMPRESSION_BMP Compression scheme used in BMP files.
IG_ISIS_COMPRESSION_GIFINTERLACED Compression scheme used in interlaced GIF files.
IG_ISIS_COMPRESSION_WANGJPEG Wang format JPEG encoding, typically used for grayscale and color only.
IG_ISIS_COMPRESSION_JPEG_PROGRESSIVE Progressive JPEG.
IG_ISIS_COMPRESSION_JP2 JPEG2 Compression.