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diff --git a/blend-wp.txt b/blend-wp.txt index 32a96a1..4ecfb19 100644 --- a/blend-wp.txt +++ b/blend-wp.txt @@ -1,3 +1,8 @@ +Note that the master is currently the server text - copy that before +making changes. + + + <script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script>In the Porter/Duff compositing algebra, images are equipped with an alpha channel that determines on a per-pixel basis whether the image is there or not. When the alpha channel is 1, the image is fully there, when it is 0, the image isn't there at all. When it is in between, the image is partially there. In other words, the alpha channel describes the the shape of the image, it does not describe opacity. The way to think of images with an alpha channel is as irregularly shaped pieces of cardboard, not as colored glass. Consider these two images: |