Add experimental overlayWith API

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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.

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This commit is contained in:

Daniel Gasienica

2015-04-24 14:57:48 -07:00

committed by Lovell Fuller

parent c886eaa6b0

commit 64f7f1d662

17 changed files with 312 additions and 8 deletions

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