| .TH IM_THRESH 3 "26 April 1991" |
| .SH NAME |
| im_thresh, im_slice \- threshold an image |
| .SH SYNOPSIS |
| #include <vips/vips.h> |
| |
| int im_thresh(in, out, threshold) |
| .br |
| IMAGE *in, *out; |
| .br |
| double threshold; |
| |
| int im_slice(in, out, threshold1, threshold2) |
| .br |
| IMAGE *in, *out; |
| .br |
| double threshold1, threshold2; |
| .SH DESCRIPTION |
| These functions have been replaced with the relational and boolean |
| packages - see |
| .B im_lessconst() |
| and |
| .B 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. |
| .SH RETURN VALUE |
| The function returns 0 on success and -1 on error. |
| .SH SEE\ ALSO |
| im_dilate(3), im_erode(3), im_lessconst(3), im_and(3). |
| .SH COPYRIGHT |
| .br |
| N. Dessipris, |
| .SH AUTHOR |
| N. Dessipris \- 26/04/1991 |
