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

Vips.Image.complexform

int
vips_complexform (
  VipsImage* left,
  VipsImage* right,
  VipsImage** out,
  ...
)

Compose two real images to make a complex image. If either left or right are VIPS_FORMAT_DOUBLE, out is VIPS_FORMAT_DPCOMPLEX. Otherwise out is VIPS_FORMAT_COMPLEX. left becomes the real component of out and right the imaginary.

If the number of bands differs, one of the images must have one band. In this case, an n-band image is formed from the one-band image by joining n copies of the one-band image together, and then the two n-band images are operated upon.

This method is not directly available to language bindings.

right

Type: VipsImage

Input image.

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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