# HDF Reference Manual

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> ### GR - Multifile General Raster Image Interface

> | GRattrinfo/mgatinf | Retrieves information about an attribute.
> | GRcreate/mgcreat | Creates a new raster image.
> | GRend/mgend | Terminates the GR interface session.
> | GRendaccess/mgendac | Terminates access to a raster image.
> | GRfileinfo/mgfinfo | Retrieves the number of raster images and the number of global attributes in the file.
> | GRfindattr/mgfndat | Finds the index of a data object's attribute given an attribute name.
> | GRgetattr/mggnatt/mggcatt | Reads the values of an attribute for a data object.
> | GRgetchunkinfo/mggichnk | Raster image identifier returned by GRcreate or GRselect
> | GRgetcompinfo/mggcompress | Retrieves raster image data compression type and compression information.
> | GRgetiminfo/mggiinf | Retrieves general information about a raster image.
> | GRgetlutid/mggltid | Gets the identifier of a palette given its index.
> | GRgetlutinfo/mgglinf | Retrieves information about a palette.
> | GRgetnluts/mggnluts | Retrieves the number of palettes for an image.
> | GRidtoref/mgid2rf | Maps a raster image identifier to a reference number.
> | GRluttoref/mglt2rf | Maps a palette identifier to a reference number.
> | GRnametoindex/mgn2ndx | Maps the name of a raster image to an index.
> | GRreadchunk/mgrchnk/mgrcchnk | Reads a data chunk from a chunked raster image (pixel-interlace only)
> | GRreadimage/mgrdimg/mgrcimg | Raster image identifier returned by GRcreate or GRselect
> | GRreadlut/mgrdlut/mgrclut | Reads a palette.
> | GRreftoindex/mgr2idx | Maps the reference number of a raster image to an index.
> | GRreqimageil/mgrimil | Specifies the interlace mode to be used in the subsequent raster image read operation(s).
> | GRreqlutil/mgrltil | Specifies the interlace mode to be used in the next palette read operation(s).
> | GRselect/mgselct | Selects the existing raster image.
> | GRsetattr/mgsnatt/mgscatt | Assigns an attribute to a raster image or a file.
> | GRsetcompress/mgscompress | Specifies if the raster image will be stored in a file as a compressed raster image.
> | GRsetchunk/mgschnk | Makes a raster image a chunked raster image.
> | GRsetchunkcache/mgscchnk | Specifies the maximum number of chunks to cache.
> | GRsetexternalfile/mgsxfil | Specifies that the raster image will be written to an external file.
> | GRstart/mgstart | Initializes the GR interface.
> | GRwritechunk/mgwchnk/mgwcchnk | Writes a data chunk to a chunked raster image (pixel-interlace only)
> | GRwriteimage/mgwrimg/mgwcimg | Writes a raster image.
> | GRwritelut/mgwrlut/mgwclut | Writes a palette.

> ###

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