ULTRAVNC DOCUMENTATION PDF

Loopback Only Needed for tests. Connections from outside are not allowed. When last client disconnects In a helpdesk scenario, you normally "Do Nothing" when disconnecting. When administering servers via remote control, you might wish to either "Lock Workstation" or "Logoff Workstation" for security reasons.

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This is the number of times a reconnect is made before the viewer close the connection. The server supplies information in whatever format is desiredby the client, in order to make the client as easy as possible toimplement.

If the client represents itself as able to usemultiple formats, the server will choose one. Pixel format refers to the representation of anindividual pixel. The most common formats are 24 and 16 bit"true-color" values, and 8-bit "color map" representations, wherean arbitrary map converts the color number to RGB values. Encoding refers to how a rectangle of pixels are sent all pixel information in VNC is sent as rectangles.

Allrectangles come with a header giving the location and size of therectangle and an encoding type used by the data which follows. These types are listed below. Allclients are required to support this encoding type. Raw is alsothe fastest when the server and viewer are on the same machine,as the connection speed is essentially infinite and raw encodingminimizes processing time. CopyRect The Copy Rectangle encoding is efficient when something isbeing moved; the only data sent is the location of a rectanglefrom which data should be copied to the current location.

Copyrect could also be used to efficiently transmit a repeatedpattern. In this encoding, a sequence ofidentical pixels are compressed to a single value and repeatcount. In VNC, this is implemented with a background color, andthen specifications of an arbitrary number of sub rectangles andcolor for each. This is an efficient encoding for large blocks ofconstant color. This allows for single-byte values to be used,reducing packet size.

This is in general more efficient, becausethe savings from sending 1-byte values generally outweighs thelosses from the relatively rare cases where very large regionsare painted the same color. Hextile Here, rectangles are split up in to 16x16 tiles, which aresent in a predetermined order.

The data within the tiles is senteither raw or as a variant on RRE. Hextile encoding is usuallythe best choice for using in high-speed network environments e. Ethernet local-area networks.

Zlib Zlib is a very simple encoding that uses zlib library tocompress raw pixel data. This encoding achieves good compression,but consumes a lot of CPU time. Support for this encoding isprovided for compatibility with VNC servers that might notunderstand Tight encoding which is more efficient than Zlib innearly all real-life situations.

Tight Like Zlib encoding, Tight encoding uses zlib library tocompress the pixel data, but it pre-processes data to maximizecompression ratios, and to minimize CPU usage on compression. Also, JPEG compression may be used to encode color-rich screenareas see the description of -quality and -nojpeg optionsabove.

Tight encoding is usually the best choice forlow-bandwidth network environments e. This means it favors speed over compressionratio. VNCViewer Toolbar.

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UltraVNC Viewer Commandline Parameters

Maybe you would like to work on it from another device by remote control. VNC is a graphical desktop sharing system that allows you to remotely control the desktop interface of one computer running VNC Server from another computer or mobile device running VNC Viewer. You will see the desktop of the Raspberry Pi inside a window on your computer or mobile device. You must enable VNC Server before you can use it: instructions for this are given below. By default, VNC Server gives you remote access to the graphical desktop that is running on your Raspberry Pi, as though you were sitting in front of it.

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VNC (Virtual Network Computing)

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