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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)