Cutscenes from KS screenshots?

How do you make cutscenes from KS screenshots? The game's window size isn't large enough for the cutscene size(600x280 or something), making the quality drop significantly when i stretch it out.

EDIT: problem fixed. thanks for the help guys

On the top, bottom, far left, and far right row of tiles, it cuts off one pixel of the tile on that respective side. Like if I put a square on the topmost row, the topmost row of pixels on that tile would be cut of. That may be your problem...I think.

How many pixels get cut off probably depends on what OS you're using, and what its window theme dealies are set to. Windows Vista, for me at least, cuts off the leftmost column. Often I just copy-paste the second leftmost column into the place the leftmost column would've occupied.

Windows XP cuts off the rightmost column and the upper row. I solve it by placing a one-pixel wide black frame around the screenshot.