NEC MPI4E Raspberry Pi Compute Module Setup Guide

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2. Select INPUT SIGNAL INFORMATION.

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

Module.

• FULL - Use FULL 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.

• LIMITED - Use LIMITED if the Compute Module is configured to output “limited” video in the

range 16-235. The display will expand the video from the range 16-235 to 0-255 internally.

The video range used by the Compute Module depends on the Operating System. By default and

depending on the OS, many distributions will automatically output a video signal to the display that uses

video levels 16 to 235. A configuration file or menu setting is used to configure the video level.

For Raspberry Pi OS and many other OS distros, the current video settings can be confirmed by typing

the following into a terminal window:

tvservice –s

The output should show something similar to the following:

“HDMI CEA (16) RGB lim 16:9, 1920x1080 @ 60.00 Hz, progressive”

If “lim” is shown, it means that limited 16 – 235 video is being output to the display.

To change this setting, a configuration file must be edited. If changing the setting from the Compute

Module itself, use the built in text editor “Nano” to edit the config.txt file:

sudo nano /boot/config.txt

Scroll to the end of the file and enter the following line:

hdmi_pixel_encoding=2

Save the file by pressing CONTROL + o then ENTER

Exit Nano by pressing CONTROL + x

Restart the Compute Module by typing:

sudo reboot

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NEC MPI4E RaspberryPi 4 System on a Chip Solution