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

Vips.Image.hist_find_indexed

int
vips_hist_find_indexed (
  VipsImage* in,
  VipsImage* index,
  VipsImage** out,
  ...
)

Make a histogram of in, but use image index to pick the bins. In other words, element zero in out contains the combination of all the pixels in in whose corresponding pixel in index is zero.

char and uchar index images are cast to uchar before histogramming, all other image types are cast to ushort. index must have just one band.

in must be non-complex.

out always has the same size and format as in.

Normally, bins are summed, but you can use combine to set other combine modes.

This operation is useful in conjunction with vips_labelregions(). You can use it to find the centre of gravity of blobs in an image, for example.

Optional arguments

• combine: VipsCombine, combine bins like this

This method is not directly available to language bindings.

index

Type: VipsImage

Input index VipsImage.

The data is owned by the caller of the method.

out

Type: VipsImage

Output image.

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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