Daniel Gasienica 64f7f1d662 Add experimental overlayWith API ...

Composites an overlay image with alpha channel into the input image (which
must have alpha channel) using ‘over’ alpha compositing blend mode. This API
requires both images to have the same dimensions.

References:
- http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
- https://github.com/jcupitt/ruby-vips/issues/28#issuecomment-9014826

See #97.

2015-06-01 14:21:01 +01:00

136 KiB

2048x1536px

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