| .TH RELATIONAL 3 "30 October 1992" |
| .SH NAME |
| im_equal, im_notequal, im_equalconst, im_equal_vec, im_notequalconst, |
| im_notequal_vec, im_less, im_lessconst, im_less_vec, |
| im_more, im_moreconst, im_more_vec, im_lesseq, im_lesseqconst, im_lesseq_vec, |
| im_moreeq, |
| im_moreeqconst, im_moreeq_vec \- relational tests on images. |
| .SH SYNOPSIS |
| .B #include <vips/vips.h> |
| |
| .B int im_equal(a, b, out) |
| .br |
| .B IMAGE *a, *b, *out; |
| |
| .B int im_equalconst(a, out, c) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B double c; |
| |
| .B int im_equal_vec(a, out, n, v) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B int n; |
| .br |
| .B double *v; |
| |
| .B int im_notequal(a, b, out) |
| .br |
| .B IMAGE *a, *b, *out; |
| |
| .B int im_notequalconst(a, out, c) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B double c; |
| |
| .B int im_notequal_vec(a, out, n, v) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B int n; |
| .br |
| .B double *v; |
| |
| .B int im_less(a, b, out) |
| .br |
| .B IMAGE *a, *b, *out; |
| |
| .B int im_lessconst(a, out, c) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B double c; |
| |
| .B int im_less_vec(a, out, n, v) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B int n; |
| .br |
| .B double *v; |
| |
| .B int im_more(a, b, out) |
| .br |
| .B IMAGE *a, *b, *out; |
| |
| .B int im_moreconst(a, out, c) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B double c; |
| |
| .B int im_more_vec(a, out, n, v) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B int n; |
| .br |
| .B double *v; |
| |
| .B int im_lesseq(a, b, out) |
| .br |
| .B IMAGE *a, *b, *out; |
| |
| .B int im_lesseqconst(a, out, c) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B double c; |
| |
| .B int im_lesseq_vec(a, out, n) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B int n; |
| .br |
| .B double *v; |
| |
| .B int im_moreeq(a, b, out) |
| .br |
| .B IMAGE *a, *b, *out; |
| |
| .B int im_moreeqconst(a, out, c) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B double c; |
| |
| .B int im_moreeq_vec(a, out, n, v) |
| .br |
| .B IMAGE *a, *out; |
| .br |
| .B int n; |
| .br |
| .B double *v; |
| |
| .SH DESCRIPTION |
| These functions perform a range of relational tests between images, or between |
| an image and a constant. Functions which take two images as arguments require |
| that the two images be the same size and have the same number of bands. They |
| can be of mixed type: you may compare an unsigned char image with a double |
| image. |
| |
| All functions return an unsigned char image, with the same number of bands as |
| the input images, in which band elements have been set to 255 for true and 0 |
| for false. |
| |
| The logical functions (im_andimage(3), im_orimage(3), im_eorimage(3)) may be |
| used to combine boolean images to make more complex tests. The selection |
| function im_ifthenelse(3) may be used to take action on the result of a test. |
| |
| .SH RETURN VALUE |
| All functions return 0 on success and -1 on error. |
| .SH SEE ALSO |
| im_ifthenelse(3), im_andimage(3). |
| .SH COPYRIGHT |
| National Gallery, 1992 |
| .SH AUTHOR |
| J. Cupitt |
