Visual display policy settings

May 28, 2016

The Visual Display section contains policy settings for controlling the quality of images sent from virtual desktops to the user device.

Preferred color depth for simple graphics

Allows lowering of the color depth at which simple graphics are set to 16 bits per pixel, potentially improving responsiveness over low bandwidth connections, at the cost of a slight degradation of image quality. This option is supported only when a video codec is not used to compress graphics.

By default, this is set to 24 bits per pixel.

Target frame rate

This setting specifies the maximum number of frames per second sent from the virtual desktop to the user device.

By default, the maximum is 30 frames per second.

Setting a high number of frames per second (for example, 30) improves the user experience, but requires more bandwidth. Decreasing the number of frames per second (for example, 10) maximizes server scalability at the expense of user experience. For user devices with slower CPUs, specify a lower value to improve the user experience.

Use video codec for compression

Allows use of a video codec to compress graphics when video decoding is available on the endpoint. When video decoding is not available on the endpoint, or when you specify Do not use video codec a combination of still image compression and bitmap caching is used.

By default, this is set to Use video codec when available.

Visual quality

This setting specifies the desired visual quality for images displayed on the user device.

By default, this is set to Medium.

To specify the quality of images, choose one of the following options:

  • Low
  • Medium - Offers the best performance and bandwidth efficiency in most use cases
  • High - Recommended if you require visually lossless image quality
  • Build to lossless - Sends lossy images to the user device during periods of high network activity and lossless images after network activity reduces; this setting improves performance over bandwidth-constrained network connections
  • Always lossless - In cases where preserving image data is vital (for example, when displaying X-ray images where no loss of quality is acceptable), select Always lossless to ensure lossy data is never sent to the user device.

If the Legacy graphics mode setting is enabled, the Visual quality setting has no effect in the policy.