# HDF Reference Manual

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> ### DF24 - Single-file 24-Bit Raster Image Interface

> | DF24addimage/d2aimg | Writes a 24-bit image to the specified file.
> | DF24getdims/d2gdims | Retrieves dimensions and interlace storage scheme of next image.
> | DF24getimage/d2gimg | Retrieves an image from the next 24-bit raster image set.
> | DF24lastref/d2lref | Retrieves the last reference number written to or read from a 24-bit raster image set.
> | DF24nimages/d2nimg | Counts the number of 24-bit raster images contained in an HDF file.
> | DF24putimage/d2pimg | Writes a 24-bit image as the first image in the file.
> | DF24readref/d2rref | Specifies the reference number of the next image to be read when DF24getimage is next called.
> | DF24reqil/d2reqil | Specifies the interlace mode for the next call to DF24getimage will use.
> | DF24restart/d2first | Specifies that the next 24-bit image read from the file will be the first one rather than the 24-bit image following the one most recently read.
> | DF24setcompress/d2scomp | Set the type of compression to use when writing the next 24-bit raster image.
> | d2scomp | Fortran-specific routine that sets the parameters needed for the JPEG algorithm.
> | d2sjpeg | Fortran-specific routine that sets the parameters needed for the JPEG algorithm.
> | DF24setdims/d2sdims | Set the dimensions of the next image to be written to a file.
> | DF24setil/d2setil | Specifies the interlace mode to be used on subsequent writes.

> ###

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