Originally Posted by
fatboy
And it most certainly does have the ability to stretch/modify the game image. In game, if You press the Select button, it will cycle through a variety of screen types and orientations. For Vertically-oriented games like 1942 and mercs, the PSP will not only stretch the image to the entire screen, but rotate it 90 degrees, to maintain image aspect ratio. for Horizontally-oriented games, like Ghosts n' goblins, it will simply stretch the image.
Personally, I prefer to stick with the original pixel size, but hay, whatever floats Yer' boat.