I used ImageMagick to convert/resize from 900×1500 to 630×1200. Also edited NGFB General parameters to 1200×1200, center/center, no crop. Result of display basically still the same. Am I doing something wrong, or missing something?
The actual scanned 3×5 card (ScanSnap IX500 – GREAT little scanner!) shows up as a jpg at approximately 900×1500 ps or 1500×900, depending on orientation. I’ve tried a lot of different aspect ratios, including the 40×21 you mentioned, albeit not in that specific size. I’ll give it a shot right now and report back.