NAME
im_thresh, im_slice - threshold an image
SYNOPSIS
#include <vips/vips.h>
int im_thresh(in, out, threshold)
IMAGE *in, *out;
double threshold;
int im_slice(in, out, threshold1, threshold2)
IMAGE *in, *out;
double threshold1, threshold2;
DESCRIPTION
These functions have been replaced with the relational and boolean
packages - see im_lessconst() and im_and() for much better ways of
doing this.
These functions operate on any non-complex input. The output image is
a unsigned char image with the same sizes and the same number of
channels as input.
im_slice() thresholds the image held by image descriptor in and writes
the result on the image descriptor out. Output is a byte image with
values less than threshold1) set to 0, values in [threshold1,
threshold2) set to 128 and values greater than threshold2 set to 255
(x in range [a,b) means a<=x<b).
im_threshold() thresholds the image held by image descriptor in and
writes the result on the image descriptor out. Output is a byte image
with values less than threshold set to 0, and values greater or equal
to threshold set to 255.
RETURN VALUE
The function returns 0 on success and -1 on error.
SEE ALSO
im_dilate(3), im_erode(3), im_lessconst(3), im_and(3).
COPYRIGHT
N. Dessipris,
AUTHOR
N. Dessipris - 26/04/1991
26 April 1991 IM_THRESH(3)