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im_buildlut
Langue: en
Version: 338946 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
NAME
im_buildlut - build a LUT from a set of x/y pointsSYNOPSIS
#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:
0 0
128 20
255 100
we generate the values:
index value
0 0
1 0.01
.. etc. linear interpolation
128 20
129 20.5
.. etc. linear interpolation
255 100
(we don't generate the index column, that's just there to show the position in the table)
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. X can start at any integer value, including negatives.
RETURN VALUE
-1 on error, otherwise 0SEE ALSO
im_invertlut(3), im_identity(3).COPYRIGHT
2006, Imperial CollegeContenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre