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