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NAME

       im_rad2float, im_float2rad - convert RAD coded images to float and back

SYNOPSIS

       #include <vips/vips.h>

       int im_rad2float( IMAGE *in, IMAGE *out )

       int im_float2rad( IMAGE *in, IMAGE *out )

DESCRIPTION

       These functions convert IM_CODING_RAD images to 3-band float and  back.

       im_rad2float(3) unpacks a 4-band uchar image in IM_CODING_RAD format to
       3-band float. RAD images are used by the radiance(1) family of programs
       for HDR imaging.

       Some  VIPS operations will work directly on the packed RAD images (such
       as im_extract_area(3) ) but many will require the image to be  unpacked
       to 3-band float for processing.

       im_float2rad(3)  packs  a  3-band  float  image back to 4-band uchar in
       IM_CODING_RAD format.

RETURN VALUE

       The functions return 0 on success and -1 on error.

SEE ALSO

       im_LabQ2Lab(3), im_format(3).

AUTHOR

       J. Cupitt - 23 March 2009

                                 25 March 2009                 IM_RAD2FLOAT(3)