Scanner Pro is the best iPad and iPhone scanner app that turns your device into a portable scanner. Get it now, if haven't done so yet.
Scan quality totally depends on your device camera capabilities. The light and the initial size of the document you scan affect the quality as well.
You can increase legibility using Scanner Pro adjustments though.
The first option is to tap the scan to open the Edit mode and choose Retake. Sometimes, it's easier to make a new scan than play around with a poorly made old one.
Once you're done with scanning, select the scan you want to change and once it is visible, tap it and locate Edit to make changes to the scan.
To change the borders of it tap change border button and drag the borders of a blue screen to highlight the preferable area.
Also, it's possible to choose the processing type Color Photo, Color Document, Document and Grayscale.
Tap Sun button to change brightness and contrast level.
To change the size of the scan choose the top button with the size or go to the app Settings to set up the Default Page Size for all your scans. To rotate the scan press Rotate.
Tap Done at the end of editing.
How to avoid distorted bill scans
Quite often, while scanning receipts or bills, we get squeezed result in the end.
To avoid this, we recommend to set Custom or Auto paper size in Scanner Pro Settings -> Scanning -> Default page size.
Tip: Also, black-and-white scans are much better within 'Grayscale' and 'Document' modes.