Accurate RGB color output via HDMI on Jetson TX2 - Reopen

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi,

Unfortunately, other topics have come up lately, so I am just getting back to it now.

Last I opened a thread on this topic here: Accurate RGB color output via HDMI on Jetson TX2 - Jetson & Embedded Systems / Jetson TX2 - NVIDIA Developer Forums

In response to my request, you suggested the following post: Full range RGB strange behavior on Nvidia Jetson AGX Xavier Developer Kit - #23 by cdsousa

We tried changing these parameters, but this did not result in accurate color output for us.

In following the results:

The right axis represents the expected RGB value, the left axis represents the received:

We started with xorg.conf set to Limited ColorRange:

Default - CMU_Enable 1, Force User Degamma 0
image
Suggested in post - CMU_Enable 0, Force User Degamma 1
image

Then with xorg.conf set to Full ColorRange

Default - CMU_Enable 1, Force User Degamma 0
image
Suggested in post -CMU_Enable 0, Force User Degamma 1
image

We also tried the others Parameter combinations (CMU_Enable 1, Force User Degamma 1 and CMU_Enable 0, Force User Degamma 0)

Do you have another proposal?

Best regards

Michael

3

Hi,

Sorry that we don’t guarantee the bit wise precision on Jetson.

4

Hi,
we were already able to ensure this with an older Jetpack version.
Shouldn’t it then also be possible with the current version?

6

Hi,

Can you explain me, why this is not the standard behavior?
Are there internal color space conversions?

Best Regards,
Michael

7

Please check the display controller section in TRM.

There are multiple conversion since the beginning of display rendering.

8

It seams there is an eror in download page.
I can’t download TRM for X2, only for orin. Is the Display section the same?

9

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