Other encodings are not efficient. Values: "Default", "1", "2", "3", "4", "5", "6", "7", "8", "9". Use specified compression level for "Tight" and "Zlib" encodings. Level 1. Level 9 offers best compression but may be slow in terms of CPU. Use high levels with very slow. The "Default" value means that the server's default compression. Values: "JPEG off", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9".
Use the specified image quality level in "Tight" encoding. Quality level. Values: "Enable", "Ignore", "Disable". Cursor shape updates is a protocol extension used to handle remote cursor. Note that current implementation of. This means that clients would not see mouse. Set this parameter to "Disable" if you always. Setting this option. This can be a reasonable setting if you don't care about. Values: "Yes", "No".
The "CopyRect" encoding saves bandwidth and drawing time when parts of. Most likely, you don't want to. If set to "No", then bit color format is used to represent pixel data. If set to "Yes", then only 8 bits are used to represent each pixel.
Values: "Normal", "Reversed". If set to "Reversed", then right mouse button button 2 will act as it. If set to "Yes", then all keyboard and mouse events in the desktop window. If a percentage value is specified, the remote cursor is reduced. Scaling takes place only when "View only". Share the connection with other clients on the same VNC server. The exact. Operate in a separate window.
This makes possible resizing the desktop,. If the server supports variable. Value: an integer in the range of [ Scale local representation of the remote desktop. The value is. Values below reduce. If the. Currently, auto-scaling is supported only. Set to "No" if you want to get rid of that button panel at the top. If set to "No", the buttons "Login again" and "Close window" won't be.
If set to "Yes", the viewer would continue to display desktop even. In this case, if the. When updating the desktop contents after receiving an update from server,. Small delay. Set this parameter to 0 to disable deferred updates. When updating the desktop after moving the mouse, schedule repaint within. This setting makes sense only when. Small delay helps to. Set this parameter to 0 to disable deferred cursor updates. After processing an update received from server, wait for the specified.
Such delay. Small delay helps the server to coalesce several small. Increasing the parameter value does not affect responsiveness on. The dynamically referenced class must implement a SocketFactory. See the. Debugging option that causes update statistics reset after the specified. This option was added to measure the. First few updates especially the very first. Debugging option that causes the viewer disconnect after the specified. If the value is. This option was added to. The data format in saved session files.
Most important. Typically, it would not work for. The code checks if it's possible. Pressing this button opens new. The GUI is pretty self-explained. Other important facts about session recording:. If you use. This is. It's not necessary to keep that window open during recording a. If you have. Zlib decoding depends on the pixel data received earlier, thus. And there is no way to tell Zlib. The viewer could re-compress raw pixel data again before. Tight encoding as well.
Unlike Zlib sessions, Tight-encoded sessions are. And, due to. The research also concluded that any TightVNC compression levels over 5 are basically useless. The 3D session captures are of my own design. I don't claim that these are representative of all modern applications. A much more thorough analysis, however, would require obtaining numerous session captures from actual users of modern 2D and 3D applications, and that would require a lot of time and money that I don't have.
I did the best I could with the resources I had. I looked into LZ4, but the problem is, as you indicate, poor compression ratio. Also, Lossless Tight itself is not very useful anymore. I have not investigated these, but the author's assertion that Zpng is "somehow more effective" than PNG does not inspire confidence.
Reply to author. Report message as abuse. Show original message. Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. For usual "desktop" software, at least "old school", before Windows Aero blurry styles, PNG usually made better screenshots than JPEG: files were both better quality crispy, rather than blurred edges full with artifacts and smaller.
Possibilities for lossless compression: 1. Since zlib is slower and generally doesn't compress as well as libjpeg-turbo, that necessitates a different mix of TightVNC encoder settings. PNG The article you referenced compares PNG and JPEG decompression using Adobe Flash, and Adobe products do not use libjpeg-turbo, to the best of my knowledge and, even if they did use libjpeg-turbo now, it's unlikely that they did in
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As well I like to play with a lot of different technologies and try to get an understanding of how they work. Remote control software to the rescue. This is the modern age of the internet, so of course, I wanted a free solution! I had a leg up because I was Windows Server at home; it allows two Terminal Server connections under the license for servicing, diagnostics, etc. I do use it since the client fits on a 3. Terminal Server opens a new session for each login, presenting a new session for each login.
Thumbing through a British computer magazine why do they cover enterprise so well compared to U. I found reference to VNC or virtual network computing. This modification of the original is designed to work over slow connections and present a reasonable speed. Windows, Linux and Java versions are currently available, so I downloaded the Windows version and got cracking. VNC is made of two components, server and client. The server is installed and configured to wait for a request from a client to handle remote control.
The client is installed and connects over a network to control the server machine. Included in the install package is the option to run VNC as a service, which I took advantage of easily enough. The user has three options to connect: best compression, fast compression and listen mode.
Best compression uses JPEG compression to give you the fastest connection speed, along with the integrated data compression schemes. This will help you get a better understanding and appreciation of what goes on in terms of data volumes and compression times when you chose one algorithm over another.
English only If you want to optimize your connection, therefore, you're going to have to try out all the different parameters and find out which combination is the best for your particular needs. The main arguments to look at are: "-encoding tight": This is the default value and the argument that gives the lowest transferred data volume. It's what you need if you are taking control remotely via a modem or ISDN line.
It will however cause a fair amount of latency due to the compression and expansion stages. It is no doubt your best bet for a local area network, whatever its configuration. This limits the color depth to 8 bits, i. You'll lose out a little on quality, but you will win in terms of required bandwidth, hence speed.
JPEG quality can be set to between 0 and 9, with 0 being "worst" and 9 being "best". The compression ratio can be set to between 1 and 9, with 1 being "mildest compression" and 9 being "strongest compression".
Here are some examples: "-compresslevel 9 -quality 0" will give full-strength data compression with a more or less lousy image, but the volumes transferred will be quite trivial. Example of some command line combinations: "-encoding tight -compresslevel 6 -quality 6": The default setting! Using in conjunction with Zebedee As is the case with all tunneling software, packets are compressed before sending them through tunnels.
To perform this compression, processor resources are of course required. Moreover, TightVNC itself uses all sorts of compression algorithms to reduce the size of the images going through the "pipe" to the controlling machine.
This tool requires processor resources. But here's the rub: compressing data that's already compressed often leads to an increase in size, so you lose out twice! In particular, it includes management of transparency effects OS Vista and higher, Office menu button To copy the driver installation file on the remote host, please verify in the TightVNC remote control configuration General tab , that the box "Copy video driver DemoForge Mirage when installing the service is checked.
Then, after having launched the TightVNC control on the remote host, the driver could be automatically and silently installed, directly from the TightVNC viewer "Mirror video driver manager" button. Depending on the remote host OS, you will be probably asked to certify the program via the "publisher verification of the driver software" window.
Then please click on "Install this driver software anyway". It may be necessary to re-launch TightVNC so that the driver is supported after installation. However, be careful because known compatibility problems may arise in some configurations and OS read more. IDEAL Administration simplifies the administration of your Windows Workgroups and Active Directory domains by providing in a single tool all the necessary features to manage domains, servers, stations and users. Contact Home. In order to look for one or more keywords , type them in the search field using space to separate them.
TightVNC uses its own highly-efficient method of compressing graphics both efficient "lossless" compression and optional "lossy" JPEG compression. Disabling JPEG compression is not a good idea in typical cases, as that makes the Tight encoder less efficient. You might want to use this option if it's. Compression speed improvement is even more impressive: Tight encoder is about ten times faster on this session as compared to Zlib encoder. Also.