>>>>> "DR" == David Rees <[EMAIL PROTECTED]> writes:
DR> After reading the recent Slashdot posting about "Low-Bandwidth
DR> X"
DR> http://slashdot.org/article.pl?sid=01/03/11/1423250&mode=thread,
DR> There were a couple interesting links posted about
DR> improvements to the VNC Hextile compression (VNC Alternate
DR> Encoder http://daggit.pagecreator.com/vnc/) and an alternate
DR> encoding called "Tight" at http://www.tightvnc.com.
DR> The first page interests me more (the alternate encoder) since
DR> the changes don't look very significant.
Unfortunately, the changes in bandwidth usage also don't look
significant or even notable in real-life situations, as compared to
the standard hextile encoding. Here are comparison results for an
example test session (24-bit color, 6 min 27 sec long).
raw | hextile | alt-hextile | tight-fast | tight | tight-max
----------+---------+-------------+------------+---------+----------
271717540 | 8716348 | 8596738 | 4186720 | 3161559 | 2361532
The numbers denote total bytes to be tranferred per session. The
"tight-fast" column above designates tight 1.2 encoding at lowest
compression level (1 from the range 1..9) with JPEG compression
disabled. The "tight-max" stands for compression level 9 and JPEG
compression at low quality level (1), and the "tight" column is tight
compression at default compression level 6 with JPEG disabled.
The test session used in this comparison is available from
http://www.tightvnc.com/sessions/slashdot-24.rfb.bz2 (3,073,017 bytes)
and can be viewer using the rfbproxy utility by Tim Waugh:
http://people.redhat.com/twaugh/rfbproxy/
DR> Has anyone from the VNC group taken the time to look over
DR> these changes and possibly incorporate them into the current
DR> VNC release? The compression improvment looks to be quite
DR> significant.
DR> -Dave
--
With Best Wishes,
Constantin
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