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The DTWAIN_GetCompressionType, DTWAIN_SetCompressionType, are used when the application requests a buffered image transfer with compression. The compression values that are available are as follows:
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Compression Type
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Description
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DTWAIN_CP_NONE
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No Compression
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DTWAIN_CP_PACKBITS
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Packbits
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DTWAIN_CP_GROUP31D
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TIFF Group 3 (1-Dimensional)
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DTWAIN_CP_GROUP31DEOL
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TIFF Group 3 (EOL)
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DTWAIN_CP_GROUP32D
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TIFF Group 3 (2-Dimensional)
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DTWAIN_CP_GROUP4
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TIFF Group 4
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DTWAIN_CP_JPEG
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JPEG Compression
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DTWAIN_CP_LZW
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LZW Compression
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DTWAIN_CP_JBIG
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JBIG Format
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DTWAIN_CP_PNG
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PNG Format
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DTWAIN_CP_RLE4
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RLE 4
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DTWAIN_CP_RLE8
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RLE 6
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DTWAIN_CP_BITFIELDS
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BitFields
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Note that all Sources must support DTWAIN_CP_NONE (No compression). The other values are dependent solely on the support that the Source provides.
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