REDUCE IMAGE TO FIT TV. SETTING ???? QUESTION ABOUT IT????

[rbowren]

The setting reduce image to fit tv is automatically set at 6%.
? Is this the best setting to have it at ?
Does anyone know or can anyone explain exactly what this does & what
efeect it would have on your slide show if you change it ?
Would your images appear bigger ? or smaller ?
How much should you change it?
I would like to fill more of the screen but I hate cropping every
picture & you loose alot of the picture when you crop it.