I scan coins at 2400 dpi with a dark background, bronze comes out far too dark against the default white background of my scanner I use Photoscape to do the circular cropping, this is a freebie photoscape download Once I have images, cropped against a black back ground I use Photoshop to stich them together. Make a large black blank image, then paste the individual scanned images, flatten layers, then crop to shape One of those jobs thats very time consuming whilst on the learning curve, but I can now do the complete proces in about 25 minutes Hope this helps David