Vector PC-Duo Technical Information download pdf (Page 85)

Host Operation

Bandwidth throttling

The user-mode screen capture technology has the ability to "throttle" itself to a restricted

amount of bandwidth. This may be preferable when responsiveness and throughput are

more important than screen quality, particularly over low-bandwidth connections.

The amount of throttling is controlled by parameters set in a "user-mode screen capture

profile". The Configure button on the Screen tab brings up a dialog that allows the end-

user to select a hard-coded, predefined configuration, or to specify a custom

configuration.

Each profile consists of the following information:

 Description string

 Image type (two choices -- Hextile (default), or JPEG). The Host will automatically use

JPEG compression if the connected Master doesn‟t support Hextile.

 Color depth (Hextile)/Image quality (JPEG). When the image type is Hextile, then the

quality value (in the range of 20-100) controls the color depth reduction feature, with the

rule that 24bpp = 100%, 21bpp = 88%, 18bpp = 75%, 15bpp = 63%, 12bpp = 50%, 9bpp

=38%, 6bpp = 25%. When the image type is JPEG, there is no color depth reduction, and

the quality value (in the range of 20-100) controls the JPEG compression level.

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Vector PC-Duo Technical Information Page 85