Messages in this thread | | | Date | Thu, 28 Oct 2004 13:21:04 +0100 | From | David Greaves <> | Subject | Re: HARDWARE: Open-Source-Friendly Graphics Cards -- Viable? |
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Helge Hafting wrote:
>Or one could go the other way - if we use 32 bits, then >consider 10 bits per color. I've always wondered about the purpose >of a 8-bit alpha channel. what exactly is supposed to show >in "transparent" places? Transparency makes sense when talking about >windows - you see the underlying window through a transparent spot. >But this is the frame buffer we're talking about - what is >supposed to be behind that? Another frame buffer? > > Well, The Hauppage 350 via the ivtv driver provides a framebuffer 'OSD' (On Screen Display) that overlays the hardware video (as in TV) layer. Transparency determines how much of the video shows through.
It's good having a framebuffer that can run X (or whatever) overlayed onto the video stream.
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