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Date: Wed,  4 Mar 2009 17:22:21 -0500
Message-ID: <9ab217670903041422t27ffc464j46b9ac1c2a976c06@mail.gmail.com>
From: "Devon H. O'Dell" <devon.odell@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] Porter-Duff alpha blending
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2009/3/4 erik quanstrom <quanstro@coraid.com>:
> okay. =A0i've corrected my misfire on the picture. =A0i've included
> =E1.gif =A0 gif encoding of the screen from plan 9 native on the 386
> =E1.png =A0 png "
> =E1pic.jpg =A0 =A0 =A0 =A0a picture taken of the screen.

This is wrong -- the idea is that you have a single white bar all the
way down, a single red bar all the way down, a single green bar all
the way down, and a single blue bar all the way down. These are then
masked by the alpha channel so they appear to `fade to black'. Instead
of this, all your images show:

white bar, rendered correctly

blue bar, should be red

green / pink bar, should be green all the way down

red / cyan bar, should be blue all the way down

--dho

> - erik