For most scanning, having a high enough resolution at your disposal for the job at hand isn't an issue. For, say, tax documents , even a 200-pixel-per-inch (ppi) scan will give you good enough ...
All the tested models scan photos at a resolution of 300 dpi (dots per inch ... as it had the least issues with over-cropping.But if you want high-quality scans that are suitable for cropping ...