Table of Contents

## 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(3X) , im_erode(3X) , im_lessconst(3) , im_and(3) .

## Copyright

N. Dessipris,

## Author

N. Dessipris - 26/04/1991

Table of Contents

- Name
- Synopsis
- Description
- Return Value
- SeeAlso
- Copyright
- Author