1IM_EYE(3)                  Library Functions Manual                  IM_EYE(3)
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NAME

6       im_eye, im_feye - creates a pattern which shows the spatial response of
7       the human visual system
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SYNOPSIS

10       #include <vips/vips.h>
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12       int im_eye(image, xsize, ysize, factor)
13       IMAGE *image;
14       int xsize, ysize;
15       double factor;
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17       int im_feye(image, xsize, ysize, factor)
18       IMAGE *image;
19       int xsize, ysize;
20       double factor;
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DESCRIPTION

24       im_feye() creates an one band float image with pels  in  [-1,+1]  of  a
25       pattern which has the following properties:
26       - the spatial frequency increases from left to right.
27       - the grey level intensity decreases from top to bottom.
28       The sizes of the produced image are determined by the entered arguments
29       xsize and ysize.  The variable factor which should be between 0 and  1,
30       determines  the number of maximum spatial frequencies present along the
31       horizontal direction.
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33       im_eye() behaves  exactly  as  im_feye(),  but  scales  the  output  to
34       [0,255].
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RETURN VALUE

38       The function returns 0 on success and -1 on error.
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SEE ALSO

41       im_grey(3), im_zone(3).
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44       N. Dessipris
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AUTHOR

47       N. Dessipris - 10/05/1991
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51                                  10 May 1991                        IM_EYE(3)
Impressum