Routines (alphabetical) > Routines: H > HDF Routines > HDF_DF24_READREF

# HDF_DF24_READREF

The HDF_DF24_READREF procedure sets the reference number of the image in an HDF file to be read by the next call to HDF_DF24_GETIMAGE.

## Syntax

HDF_DF24_READREF, Filename, Reference_number

## Arguments

### Filename

A scalar string containing the name of the file to be read.

### Reference_number

The reference number for a 24-bit raster image.

## Keywords

None

## Version History

4.0 | Introduced