Alpha-blending about gil HOT 4 OPEN

How about start on support the same RGB views?

There is nothing wrong with features specific or limited to narrow set of specific pixel/view types.
Starting small with a proof of concept, well tested, documented...it's actually a common and appreciated practice, and not only in GIL, I guess.

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Consider it for GSOC. Thanks.

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Found one alpha-blending implementation for boost::gil here https://github.com/boost-gil/gil-contributions-archive/blob/sandbox/boost/gil/extension/toolbox/blend.hpp

Here's boost::compute based image generation sample: https://github.com/ohhmm/generator/blob/5ecaa727352d34fd0b0f134c9b8ceed4a202f475/picture-pattern-generate/generator.cpp#L55

Any plans to use boost::compute for boost::gil?

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Yes, the github.com/boost-gill is our sister org. I forgot there are some blending implementations indeed.

Any plans to use boost::compute for boost::gil?

No plans, AFAIK, but it's possible:

GIL can accept variety of features via extensions, including domain-specific features, features with new dependencies, features with non-Boost externals as dependencies. So, I'd suggest to consider the Boost.Compute-based blending as an extension first.
It is easy to move features from extension to core, but once a feature is in core, then removing it is not easy. See more on core vs extensions #668

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