Samsung LS21BRBAB-XAA - Manual (Page 39)

picture, you must set the "Blue screen" mode to "Off".
Reset
Picture parameters are replaced with the factory default
values.
1) Image Reset
: Image parameters are replaced with the factory
default values.
- Available in Analog Mode Only
2) Color Reset
: Color parameters are replaced with the factory
default values.
- Available in Analog/Digital(PC) Mode Only
Analog
- Image Reset
Analog
- Color Reset
Digital : PC
- Color Reset