There are other scan-to-PDF products available, but IntSig's has some unique image management features as well as a breadth of upload and cloud storage options. CamScanner takes a high-resolution picture of whatever you are interested in, and then "scans" the image. Prior to scanning, you can rotate the image in 90-degree increments, and you can drag several handles to crop the image. There are controls for brightness and contrast as well as for quality of the image.
The scan algorithm is very forgiving of shaky hands, or of the image being a little off center or off square. It's smart enough to turn and center the item to be scanned as part of the scanning process. The app seems to detect edges and rectangular items when it analyzes the picture that it's scanning. It assumes that the user will want to crop at the detected edges, and it places the handles for cropping along those edges.
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