29 lines
786 B
Groff
29 lines
786 B
Groff
.TH IM_ROTQUAD 3 "07 July 1990"
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.SH NAME
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im_rotquad \- rotates the four quadrants of an image
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.SH SYNOPSIS
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.B #include <vips/vips.h>
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.B int im_rotquad(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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im_rotquad rotates the four quadrants of the image held by the image
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descriptor in and writes the result on the image descriptor out.
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The function is used primarily to rotate a fourier transform in such a way
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that the coordinate (0,0) is near the centre of the image, the so-called
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optical transform.
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The function operates on any input;
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output has the same format, sizes and bands as input.
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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_fwfft(3), im_invfft(3), im_scaleps(3).
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.SH COPYRIGHT
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.br
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N. Dessipris
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.SH AUTHOR
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N. Dessipris \- 06/07/1990
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