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Title: Broken alpha handling in images by mdboom · Pull Request #545 · matplotlib/matplotlib · GitHub

Open Graph Title: Broken alpha handling in images by mdboom · Pull Request #545 · matplotlib/matplotlib

X Title: Broken alpha handling in images by mdboom · Pull Request #545 · matplotlib/matplotlib

Description: matplotlib: plotting with Python. Contribute to matplotlib/matplotlib development by creating an account on GitHub.

Open Graph Description: As reported by Daniel Hyams, matplotlib does not handle alpha blending in images correctly. Agg expects premultiplied alpha, but we often send it unmultiplied alpha set_alpha on the Image artis...

X Description: As reported by Daniel Hyams, matplotlib does not handle alpha blending in images correctly. Agg expects premultiplied alpha, but we often send it unmultiplied alpha set_alpha on the Image artis...

Opengraph URL: https://github.com/matplotlib/matplotlib/pull/545

X: @github

direct link

Domain: github.com

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og:image:altAs reported by Daniel Hyams, matplotlib does not handle alpha blending in images correctly. Agg expects premultiplied alpha, but we often send it unmultiplied alpha set_alpha on the Image artis...
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Make "set_alpha()" work on images. Now, alpha blending is handled in the backends. Tested and works on Agg, Pdf and Svg. (Ps does not support alpha).https://github.com/matplotlib/matplotlib/pull/545/commits/e406c05bd0c4ae9b0d6cc5aef5771740db0db240
https://github.com/mdboom
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e406c05https://github.com/matplotlib/matplotlib/pull/545/commits/e406c05bd0c4ae9b0d6cc5aef5771740db0db240
https://github.com/matplotlib/matplotlib/tree/e406c05bd0c4ae9b0d6cc5aef5771740db0db240
Tell Agg that we're giving it pre-multiplied image datahttps://github.com/matplotlib/matplotlib/pull/545/commits/1dac36d829a8737741e1b223049042a4bc096070
https://github.com/mdboom
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