| .TH IM_INVERT 3 "11 April 1990" |
| .SH NAME |
| im_invert \- inverts an image pointed by an image descriptor. |
| .SH SYNOPSIS |
| .B #include <vips/vips.h> |
| |
| .B int im_invert(in, out) |
| .br |
| .B IMAGE *in, *out; |
| .SH DESCRIPTION |
| .B 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. |
| .br |
| 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! |
| .SH RETURN VALUE |
| The function returns 0 on success and -1 on error. |
| .SH SEE\ ALSO |
| im_add(3), im_lintra(3), im_multiply(3). |
| .SH AUTHOR |
| J. Cupitt \- 21/7/93 |
