Dell Wyse Enhanced Ubuntu Linux T50 Manual de usuario descargar pdf (Pagina 64)

Chapter 7. The ThinLinc Client

situation. A safe choice is to let the system automatically select the best encoding by checking the

Auto select checkbox above.

Encoding: Tight

This choice selects the Tight encoding method. With this encoding the zlib compression library is

used to compress the pixel data. It pre-processes the data to maximize compression ratios, and to

minimize CPU usage on compression. Also, JPEG compression may be used to encode color-rich

screen areas. The zlib compression level and the JPEG compression ratio can be manually changed.

See Custom compression level and Allow JPEG compression below. Tight encoding is usually the

best choice for low-bandwidth network environments (e.g. slow modem connections).

Encoding: ZRLE

This choice selects the ZRLE encoding method.

Encoding: Hextile

This choice selects the Hextile encoding method. With Hextile the screen is divided into rectangles,

split up in to tiles of 16x16 pixels and sent in a predetermined order. Hextile encoding is often the

best choice for using in high-speed network environments (e.g. Ethernet local-area networks).

Encoding: Raw

This choice selects the Raw encoding method. This is the simplest of the encoding methods. It

simply sends all the graphic data of the screen, raw and uncompressed. Since this method use the

least processing power among the possible methods this is normally the best choice if the server and

client runs on the same machine.

Custom compression level

By selecting this option you choose to override the standard compression level used when

compressing data with the Tight encoding. You can manually select the wanted compression level

by entering a number between 1 and 9. Level 1 uses a minimum of CPU performance and achieves

weak compression ratios, while level 9 offers best compression but is slow in terms of CPU

consumption on the server side. Use high levels with very slow network connections, and low levels

when working over high-speed network connections. This applies to the Tight encoding only!

Allow JPEG compression

By selecting this option you choose to override the standard JPEG compression quality of color-rich

parts of the screen. JPEG is a "lossy" compression method for images that helps the Tight encoding

to signiﬁcantly reduce the size of the image data. The drawback is that the resulting image,

depending of selected compression ratio, can be blurred and grainy. You can manually select the

wanted image quality by entering a number between 0 and 9. Quality level 0 gives bad image

quality but very impressive compression ratios, while level 9 offers very good image quality at

lower compression ratios. Note that the Tight encoder uses JPEG to encode only those screen areas

that look suitable for lossy compression, so quality level 0 does not always mean unacceptable

image quality.

Color level

This block of choices selects the number of colors to be used for the graphic data sent from the

server to the client. The setting has four levels, Full, Medium, Low and Very low. The default and

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Dell Wyse Enhanced Ubuntu Linux T50 Manual de usuario Pagina 64