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.