0.65 Blur Brightness Controls the Blur Brightness. Value is effective between 0 to 1. Please note that If the "Blur Sigma" value is set to '0', this value will be ignored and shows the lockscreen with max brightness. 1 Blur Sigma Controls the Blur Sigma. Value is effective between 0 to 100 (But not limited) based on the Background Picture. Try some thing like 5, 10, 15, 20,... to suit your liking.