Can I Submit An App?

If you have PDF files from a scanner, sometimes they are too dark due to settings.
WHAT IF you wished to lighten up the pages?
I could find no program or add-on to work within existing PDF's to alter levels on a page.
It seemed the only solution was to export each page as an image, then use Photoshop or some image program to process each page. If savvy you could make a batch file.
THEN, recombine each image into a New PDF.

So I asked ChatGPT to help build such an app. After a day's collaboration we tested out many iterations and GUI interfaces.
It involved Python scripts that downloaded Python, and PDF extraction apps.
In the end ChapGPT rolled all of this into a single portable app needing no downloads or install..
All you need is to extract "PDF Levels.zip" into the folder of your choice. Run PDF Levels.exe (needed dlls are in folder "internal").
Zip is 23 megs
You can do preview test of single page, then sliders will adjust levels. It opens with default values that worked for me.
Readme lists more info and sources.

It's fast! 113 pages manual done in about 1 minute!
see post and before and after images: https://thewindowsforum.com/threads/chatgpt-made-me-a-pdf-levels-fix-for-scanned-files.107422/