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7 Miscellaneous Configuration Items

Note: Many of the options for the Raspbian OS can be automatically configured using the Compute

Module Configuration Tool for Raspbian see “Compute Module Configuration Tool for Raspbian” on

page 65.

7.1 Configuring the correct HDMI video level encoding and decoding

The Compute Module can output video to displays that have video levels either in the range 0-255

(known as “full”) or in the range 16-235 (known as “limited” or “RGB limited”). Configuration settings for

the OS determine which range will be output. The NEC display can accept either range sets and will

display the video correctly, as long as it is configured correctly to match the video range from the

Compute Module. However, it is recommended to use the “full” range since it will give the maximum

number of displayable colors.

A mismatch between the output range from the Compute Module and the display will result in either:

• Blacks appearing as gray and whites being too dark.

o Cause: Compute Module outputs “limited” video range and the display is set to “RAW”.

• Dark gray levels being crushed and whites being clipped.

o Cause: Compute Module outputs “full” video range and the display is set to “Expand”.

The video range used by the display is configured as follows:

1. Navigate to the MULTI INPUT menu on the OSD.

2. Select TERMINAL SETTINGS.

3. The VIDEO LEVEL setting determines how the display will handle the video from the Compute

Module.

• RAW - Use RAW if the Compute Module is configured to output “full” video in the range 0-

255. This is the recommended configuration since it provides the maximum number of

displayable colors. The display will not modify the range of the video signal levels.

NEC C751Q User Manual

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