MobileRead Forums - View Single Post - Manually adjusting the Brightness and Warmth

pazos · 07-06-2021, 01:33 PM

IIRC - I might be completely wrong:

The warmth is fixed to 10 values, all these covered by KOReader. So it is impossible to "add more red"
The brightness might be different: there're 255 values and we map those to 100 steps. So each new brightness step covers 2.55 values.

It should be barely perceptible, but you can try it yourself writting 1 to your device's sysfs node.

Something like

Code:

echo 1 > /sys/class/backlight/mxc_msp430.0/brightness

would give you the minimum brightness the HW is capable.

07-06-2021, 01:33 PM	#2
pazos cosiñeiro Posts: 1,406 Karma: 2451781 Join Date: Apr 2014 Device: BQ Cervantes 4	IIRC - I might be completely wrong: The warmth is fixed to 10 values, all these covered by KOReader. So it is impossible to "add more red" The brightness might be different: there're 255 values and we map those to 100 steps. So each new brightness step covers 2.55 values. It should be barely perceptible, but you can try it yourself writting 1 to your device's sysfs node. Something like Code: echo 1 > /sys/class/backlight/mxc_msp430.0/brightness would give you the minimum brightness the HW is capable.