libvips/man/im_buildlut.3

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2007-08-29 18:23:50 +02:00
.TH IM_BUILDLUT 3 "June 2006"
.SH NAME
im_buildlut \- build a LUT from a set of x/y points
.SH SYNOPSIS
#include <vips/vips.h>
int
.br
im_buildlut( DOUBLEMASK *input, IMAGE *output )
.SH DESCRIPTION
.B im_buildlut(3)
constructs a LUT, interpolating a set of x/y points. Interpolation is strictly
piecewise linear. For example, if the input is:
12 100
14 110
18 120
we generate
100 (12)
105
110
112.5
115
117.5 (17)
the x axis (12 .. 17) is implied. The x/y points don't need to be
sorted: we do that. You can have several Ys ... each becomes a band in the
output LUT.
.SH RETURN VALUE
-1 on error, otherwise 0
.SH SEE ALSO
im_invertlut(3), im_identity(3).
.SH COPYRIGHT
2006, Imperial College