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im_hist - create a displayable histogram from an image
#include
<vips/vips.h>
int im_hist(in, plotofhist, bandno)
IMAGE *in, *plotofhist;
int bandno;
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=0 a displayable histogram
of all input bands is created else the histogram of bandno only is created.
The function expects as input a valid unsigned char image of any size.
The sizes of the produced image file are 256 by 256. The created histogram
is scaled with its max value corresponding to 255.
All functions
returns 0 on success and -1 on error.
im_histgr(3)
, im_mmapin(3)
,
im_openout(3)
, im_setbuf(3)
.
N. Dessipris
N. Dessipris - 10/05/1991
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