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Harris Geospatial / Docs Center / IDL Reference / I/O - HDF / HDF_GR_SETCOMPRESS

HDF_GR_SETCOMPRESS

HDF_GR_SETCOMPRESS

This function specifies the type of compression for the specified HDF GR raster image.

Syntax


Result = HDF_GR_SETCOMPRESS(ri_id, comp_type, comp_prm)

Return Value


Returns SUCCEED (0) if successful or FAIL (-1) otherwise.

Arguments


ri_id

Raster image identifier returned by HDF_GR_CREATE or HDF_GR_SELECT.

comp_type

Compression method for the image data. Valid values are:

  • 0 = no compression
  • 1 = RLE run-length encoding
  • 3 = Skipping Huffman compression
  • 4 = GZIP compression
  • 6 = JPEG compression

comp_prm

Compression parameters. If Skipping Huffman is used, set comp_parm to the skipping size (the size in bytes of the data elements). If GZIP compression is used, set comp_parm to an integer ranging from 1 (fastest) to 9 (most compressed).

Keywords


None

Version History


5.2

Introduced



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