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Date: Thu, 28 Aug 2008 16:47:11 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] [5076] VNC: Support for ExtendedKeyEvent client
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To: qemu-devel@nongnu.org
Cc: Alexander Graf <agraf@suse.de>

Christian Brunschen wrote:
>
>>
>> I doubt you'll see a benefit from this.  PNG compression is paletted 
>> and compressed (just like GIF).
>
> PNG does more than that. PNG supports full colour (up to 16 bits per 
> colour component) including a full alpha channel, and has various 
> filters that are applied to the image data to improve compression. Not 
> to mention PNG is much more than GIF.

Tight also has various filters to improve the compression.  The VNC 
protocol won't support 16-bit color components or an alpha channel so 
this isn't an advantage.

> As an aside - is the Tight protocol documented somewhere? In actual 
> documentation rather than source code, I mean?

Just the source code.  Although there's a big comment block that 
describes it as well as the rest of the VNC protocol docs do.

Regards,

Anthony Liguori