No need!
Also, I forgot to mention. PLEASE make sure you save before doing this. If you're in the middle of playing your file and change this you will go to a black screen.
After you save the settings (preferences -> save preference changes) and restart everything will load just fine.
To be honest I haven't touched my HG rom in about a week now but y'know, I have the same problem too with the brightness. I'll look and see if I can't find a way to fix this! :)
Hello, are you playing the English patch by Magius? Do you know how to change the brightness of the graphics because mine is a bit dark, even if I play morning it is dark. Please reply, I need it for making tiles. Image below.