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im_invert - inverts an image pointed by an image descriptor.
#include
<vips/vips.h>
int im_invert(in, out)
IMAGE *in, *out;
im_invert inverts the image held by image descriptor
in and writes the result on the image descriptor out. The function works
on FMTUCHAR images only. The result at point x of the input image is 255-x
at the output image. Input can have any no of channels.
This is not a generally useful program -- it is included as an example
of a
very simple new-style IO function. Feel the power of the source, Luke!
The function returns 0 on success and -1 on error.
im_add(3)
,
im_lintra(3)
, im_multiply(3)
.
J. Cupitt - 21/7/93
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