4-bit grayscale blather

[Rui Jorge Coelho]

> Date: Wed, 7 Nov 2001 09:58:17 -0800
> From: Frank Evan Perdicaro <frank "at" dsea.com>
> Subject: Re: 4-bit grayscale blather

> > Date: Mon, 5 Nov 2001 09:16:09 -0000 
> > From: Rui Jorge Coelho <rui.coelho "at" altitude.com>
> > Subject: 4-bit grayscale winvnc
> > 
> > Does anyone know of a 4-bit grayscale WinVNC ? Is it possible to
> > improve the bandwidth usage of the VNC protocol by reducing the
> > color depth ? 
> 
> > From my experience using tightVNC, the best results (lower bandwidth) 
> > are achived by using 8bits+zlib, instead of 16/24/32bits+jpeg.

> Beat around in the archives and you will run across my notes on
> variable-color-depth, variable-resolution VNC modification.

> By emulating the eye, and adding substantial code to alter the
> resolution and depth based on screen and cursor activity, it is
> possible to get a very large speedup.  I recall calculating that 24:1
> was easy, and 96:1 was hard.  At some point not far after 24:1,
> protocol overhead sharply reduces theoretical gains.

> I think Const is probably the best person in the world to do this, but
> he is busy doing other things.  Make no mistake this, is a very complex
> bit of coding, both in theory and in execution.  If Const and I had
> nothing else to do for a month, the two of us could probably finish
> it.  I write that based on what I have seen of Const's code and my
> long-term familiarity with a very similar series of problems.

Just read your notes on variable-color-depth and variable-resolution. Your
right, its way to complexed for me. My objective is to have a fast VNC
connection at the expense of color depth. I took a look at the VNC code 
that manipulates palettes. Why not start by adding a 1 bit per pixel 
mode (black or white) ?

Rui.
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