im_buildlut(3) - Linux man page

Name

im_buildlut - build a LUT from a set of x/y points

Synopsis

#include <vips/vips.h>

int
im_buildlut( DOUBLEMASK *input, IMAGE *output )

Description

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.

Return Value

-1 on error, otherwise 0

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