Cleanup / touchups brush tool to erase imperfections (folds, creases, stains, etc.)

[nekohayo]

One thing that I find extremely useful in the Adobe Scan app is the ability to fix imperfections with a brush-like tool. It can either use the surrounding background color automatically, or let you specify a custom color (ex: pure white), in addition to the tool's brush size.

It works roughly like this: https://www.youtube.com/watch?v=-yo9bdaO-lI

I can imagine that this is probably not super trivial because it goes into the realm of raster image editing and touchscreen interaction, but it would be absolutely fantastic to have for many reasons. It might also partly reduce the need for quadrilateral cropping adjustments (#72 / #59) in cases where, for example, the edge is dirty, torn or cut non-straight against a dark/contrasted background. In fact, even if the quadrilateral is right, you don't want the "wooden table" showing up through the corner, you want it to be a clean white background instead, as if the receipt was not even torn/cut (and it also saves on the resulting filesize).

[AdamWill]

Hah, Jeff beat me to it. Hi, Jeff!

Agree - I love the idea of this app, grabbed it to try it out and it sure beats doing it manually. But I immediately noticed it doesn't clean up camera shadows or account for non-flat pages, which almost all the things I'd be likely to scan are going to be. Receipts are usually printed off a roll, and when you're travelling you very often fold up larger sheets of paper until you're in a position to scan them..

[pynicolas]

Thanks for sharing the idea, I understand it can be useful in some cases.
FairScan's focus is on automatic processing, so I plan to improve the automatic reduction of shadows (it currently only works on black and white documents and is very basic) before looking into this kind of feature.