im_hist - create a displayable histogram from an image
int im_hist( in, plotofhist, bandno )
IMAGE *in, *plotofhist;
im_hist() creates a displayable histogram file for the image held by
the image descriptor in. The created displayable histogram is held in
the IMAGE descriptor plotofhist. If bandno == -1 a displayable
histogram of all input bands is created else the histogram of bandno
only is created.
See im_histplot(3) for rules on the size and scaling og the result.
All functions returns 0 on success and -1 on error.
N. Dessipris - 10/05/1991
10 May 1991