The overscan option can be enabled if you have black borders on the image or if your image is cropped.
START
button on your controller)ADVANCED SETTINGS
OVERSCAN
optionYou must reboot your Raspberry Pi after changing this option.
disable_overscan=0
overscan_left=24
overscan_right=24
overscan_top=24
overscan_bottom=24
The value specifies the number of pixels to be ignored at the edge of the screen. Increase this value if the image extends beyond the edge of the screen; decrease it if there is a black border between the screen edge and the image.
overscan_scale=1