| Option Category | # # DIRECT3D POST-PROCESSING OPTIONS # |
| Description | This option sets the amount of alpha blending applied to the scanline effect drawn by the HLSL renderer. 1.0 is completely black and 0.0completely transparent. |
| Full Command | -scanline_alpha <float> |
| Alt. Command | none |
| Reverse Command | none |
| Example | mame64 pacman -hlsl_enable -scanline_alpha 0.5 |
| mame.ini Command | scanline_alpha |
| Command Default | 0.0 |
| Argument Format | <float> |