Extensions for fine-grained image quality control

[DRC]

James Weatherall wrote:
> [snip]
>
> FYI, this sounds very similar to what the standard TRLE encoding already does.
>   
I haven't seen TRLE and can't seem to find any information on that
protocol.  Is it available in a current release of RealVNC?

One of the problems I ran into with Hextile, in particular, was that the
tile sizes were too small (16x16), which caused the protocol to be very
latency sensitive, even on LANs.  The TurboVNC Lossless-Tight protocol
tries to use 64 kpixel tiles, in general.  And of course, Raw is
inefficient because it sends way more data than necessary.  The basic
goal with Lossless-Tight was to reduce the CPU usage to almost nothing
(use very little additional CPU over Raw) but provide a significant
speedup for typical 3D apps (CAD applications, for instance, are never
going to use very many colors.)