25 lines
781 B
Groff
25 lines
781 B
Groff
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.TH IM_INVERT 3 "11 April 1990"
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.SH NAME
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im_invert \- inverts an image pointed by an image descriptor.
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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.B int im_invert(in, out)
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.br
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.B IMAGE *in, *out;
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.SH DESCRIPTION
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.B im_invert
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inverts the image held by image descriptor in and writes the result on the
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image descriptor out. The function works on FMTUCHAR images only.
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The result at point x of the input image is 255-x at the output image.
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Input can have any no of channels.
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.br
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This is not a generally useful program -- it is included as an example of a
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very simple new-style IO function. Feel the power of the source, Luke!
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.SH RETURN VALUE
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The function returns 0 on success and -1 on error.
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.SH SEE\ ALSO
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im_add(3), im_lintra(3), im_multiply(3).
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.SH AUTHOR
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J. Cupitt \- 21/7/93
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