Hi Mike, Thanks very much, I applied your SQL and we now have a sharp image in guacamole :) I also found out that we see the best performance with ultra encoding, which seems to be also what tigervnc is using.
Best regards, /M On Mon, May 23, 2016 at 10:07 PM, Mike Jumper <mike.jum...@guac-dev.org> wrote: > Hi Miroslav, > > It's likely that TigerVNC is using JPEG to encode the updates it send to > Guacamole, hence the artifacts / poor quality. This will also lead to > performance degradation, as the JPEG artifacts will decrease the efficiency > of the PNG compression used by Guacamole for most images. > > You can change this behavior by explicitly setting the "encodings" parameter > of the VNC connection(s) to a space-delimited list of encodings which does > NOT include the "tight" encoding (the VNC encoding that uses JPEG). A > known-good value is: > > zrle ultra copyrect hextile zlib corre rre raw > > If you are using the database auth, I have a SQL script which updates all > VNC connections, setting the "encodings" parameter to the above value: > > https://gist.github.com/mike-jumper/35987e86c64cac389e8b > > This shouldn't be a problem going forward, as the default for "encodings" > has been changed to exclude the "tight" encoding. If you're OK with building > from git, that should solve things as well: > > https://github.com/apache/incubator-guacamole-server > > If you follow the current version of the manual for building from git, > beware that the manual still refers to the version of Guacamole prior to its > migration to the Apache Incubator, so the names and URLs of the git > repositories will be incorrect. The new repositories are all of the form > "https://github.com/apache/incubator-guacamole-*";. > > Thanks, > > - Mike > > > On Mon, May 23, 2016 at 12:43 PM, Miroslav Vadkerti <th...@vadkerti.net> > wrote: >> >> Hi, >> >> I am experiencing bad image quality when connecting to my TigerVNC server >> via guacamole. With the TigerVNC viewer the image is sharp. Any idea what >> could be wrong? Could be that the guacamole vnc client is using wrong >> encoding or jpeg transport? >> >> Thanks, >> /M > >
