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Showing content from http://libvips.github.io/libvips/API/current/method.Image.invertlut.html below:

Vips.Image.invertlut

int
vips_invertlut (
  VipsImage* in,
  VipsImage** out,
  ...
)

Given a mask of target values and real values, generate a LUT which will map reals to targets.

Handy for linearising images from measurements of a colour chart. All values in [0,1]. Piecewise linear interpolation, extrapolate head and tail to 0 and 1.

Eg. input like this:

4 3
0.1 0.2 0.3 0.1
0.2 0.4 0.4 0.2
0.7 0.5 0.6 0.3

Means a patch with 10% reflectance produces an image with 20% in channel 1, 30% in channel 2, and 10% in channel 3, and so on.

Inputs don’t need to be sorted (we do that). Generate any precision LUT, default to 256 elements.

It won’t work too well for non-monotonic camera responses (we should fix this). Interpolation is simple piecewise linear; we ought to do something better really.

Optional arguments

• size: gint, generate this much

This method is not directly available to language bindings.

out

Type: VipsImage

Output LUT.

The argument will be set by the function. The caller of the method takes ownership of the returned data, and is responsible for freeing it.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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