Obtains an HDF Raster 8 image and associated palette.

filename—The name of the HDF file.

image—A byte array which contains the obtained HDF Raster 8 image.

palette—A byte array (3-by-256) which contains the color palette associated with the HDF image. Use the HDFLCT procedure to load the palette.

status—The status of the function call, where:

Help—If present and nonzero, lists the usage for this routine.

Usage—If present and nonzero, lists the usage for this routine. (Same as the Help keyword.)

HDFGETR8 obtains an HDF Raster 8 image from the named HDF file. HDFGETR8 will read the current (or first) Raster 8 image in the file and position the HDF active pointer to the next Raster 8 image. You can read all Raster 8 images in an HDF file using successive calls to HDFGETR8. The return status is set to FAIL when the function reads beyond the last Raster 8 image.

You can load the HDF palette associated with the image into PV‑WAVE directly using the HDFLCT procedure.

Use DFR8READREF or DFR8RESTART to position the active pointer within the HDF file.

hdf_init

@hdf_common

testfile = !Data_dir + '/raster8.hdf'

status = DFR8RESTART()

IF (status EQ FAIL) THEN $

   MESSAGE, 'Failed at DFR8restart for HDFGETR8.'

status = HDFGETR8(testfile, image, palette)

IF (status EQ FAIL) THEN $

   MESSAGE, 'HDFGETR8 failed.' $

ELSE LOADCT, 0 & TV, image

HDFGET24, HDFLCT, HDFPUTR8

Also refer to the following routines in the HDF Reference Manual:

DFR8GETDIMS, DFR8GETIMAGE, DFR8NIMAGES, DFR8READREF, DFR8RESTART, HISHDF

For more information on using the HDF interface and the calling sequence for the entire suite of HDF base functions, refer to PV-WAVE HDF Interface.

For a complete list of the HDF convenience routines, refer to Functional Summary of Routines.