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GBA Shaders and Resolution
You can try to use "vcgencmd scaling_sharpness" command followed by a value, I use 80.
It does a great job on my side on the TFT but no idea on how it behave on HDMI :S
This is not a permanent solution, if you want to do so, you will need to add it to /etc/local.rc, before the last line followed but "&".
With this solution, you don't need to change the viewport size Smile

For the too bright color, I am not sure of what you mean.
What revison of the motherboard do you have? (last one have ABXY pads on the motherboard itself)
If have not the last one, you need the brightness control ribbon cable to be able to dim the screen backlight. You can try to contact Freeplaytech from there shop website as this product is no more in sell, with some luck, you may be able to get your hands on one Smile
If you have the last revision or the brightness control ribbon cable already install, on EmulationStation, go to Retropie menu >Freeplay Brightness control.

I hope I haven't said too much crap, I am not home and don't have the device on hand right now :S

Messages In This Thread
GBA Shaders and Resolution - by Nic Lobo - 12-02-2019, 02:55 AM
RE: GBA Shaders and Resolution - by Porcinus - 12-03-2019, 05:32 PM
RE: GBA Shaders and Resolution - by Nic Lobo - 12-04-2019, 01:31 AM

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