Play a bit with the stretch option (see sildeshow options)
Here is a clear description of the stretching options:
True: Makes images fill the player area by “overstretching” them, IE, making their smallest dimension fit the player size (maintains aspect ratio).
False: Makes images fit inside the player area. IE, their largest dimension is the same size as the player (maintains aspect ratio).
Fit: Stretches images to fit the inside of the player (DOES NOT maintain aspect ratio).
None: Does not resize image at all. Appears to center the image in the player and crops whatever is too big (maintains aspect ratio)
Also, images will display improperly if they are too large. I’m not sure what the limit is, but definitely above 2000px is too big.
Note that NGG does NOT automatically resize images on upload. You have to do this manually:
After you upload them, click the checkbox next to new images on their gallery page, then pick the “Resize Images” bulk editing option, and click ok.
NGG will now resize the images down to the size you specified in Gallery >> Options >> Images
