I am experiencing Scannable issues with color as well.
I have latest Scannable version installed (2.3.3) on iOS at latest update (13.3. 1) running hardware iPhone 7 Plus. I check for updates to iOS and app weekly and always update both when updates are available.
I tried ambient office lighting and a photographic copy stand with special photographic halogen lighting that I use to reproduce historic artifacts accurately for presentations. .
For some reason, some pages (mostly the 1st page of a pdf) look like Sepia toned photographs on the halogen lighting. The second page comes out like I would expect - more accurate.
I have no problem usually with monochrome copy sources until recently. I recently copied one document and would only scan the 2nd page accurately.
The halogen lights work great for an iPhone camera photos so I suspect the sepia tone issue is an artifact of Scannable processing. Sample attached for your consideration.
Kuranda
Sample Scannable color problem.docx
