im_buildlut

Langue: en

Autres versions - même langue

Version: 150890 (fedora - 04/07/09)

Section: 3 (Bibliothèques de fonctions)

Sommaire

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

SEE ALSO

im_invertlut(3), im_identity(3). 2006, Imperial College