How to get information from PNG in the highest possible quality?

Question

Scanning

spoiler

PNG
was able to achieve this result. Can it be even better?

Answer 1

PNG is a format for storing lossless image data . You need to apply some filters to the attached image to improve perception. This processing can be done using automatic leveling, for example.

Answer 2

From simple algorithms - brightness, contrast.
More complicated - a group of unsharp mask relatives, algorithms based on the Canny algorithm, algorithms based on the Gauss algorithm (all sorts of edge detection algorithms).
Take ImageJ and Photoshop. Fumble around there in these menu items.