Raw by itself is completely useless.  However, using a combination of
Raw tiles and paletted tiles, both encoded using the Tight encoder, is
useful.  TurboVNC 0.5 does that for its mathematically lossless modes.

What we found is that there is really no reason to use any encoder other
than the Tight encoder.  ZRLE and Hextile do not produce any results
that can't be reproduced better and faster using Tight.  Hextile, in
particular, can't perform well, even on the fastest networks, because
the tile size is way too small.  Sending 16x16 image updates will be
bound by the network latency, even on a local-area network.

Peter Åstrand wrote:
> On Wed, 11 Mar 2009, Adam Tkac wrote:
>
>> We should always send "second preferred" encoding to server in case
>> that server doesn't support JPEG. So, in theory, existing code will be
>> improved this way:
>>
>> for speeds >= 16Mbps client sends "Raw, JPEG, hextile, zrle"
>> for speeds < 16Mbps client sends "JPEG, zrle, hextile"
>
> As I understand it, Pierres results shows that JPEG is preferrable
> even on fast networks.
>
> My experience is that Raw is pretty bad even if you have a superfast
> connection.
>
> Regards, ---
> Peter Åstrand        ThinLinc Chief Developer
> Cendio AB        http://www.cendio.com
> Wallenbergs gata 4
> 583 30 Linköping    Phone: +46-13-21 46 00
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