video 18 or 24 bits

[puiu]

Looking to improve video performances I measured the RGB lines around video digital-analog converter.
I found out that R0,R1, G0, G1, B0, B1 (least two significant bits of each color) are sitting high all the time.
Looks like the unit works with 18 bits not 24 bits of color.

Is it a way to enable 24 bits mode?

Thank you

[irads]

What digital-to-analog converter you relate to? fit-PC2i video output is digital.