I have a huge game-map (Micro Macro Crime City, 25857x17709 pixels)) which I scanned with my PC in 600dpi using Adobe Photoshop Elements and then merged the smaller parts together. Now I want to color it just for fun and tried to import the image in Goodnotes and Procreate, but the resolution there was too bad to work with.
Then I thought about vectorizing it and found Vectornator as a possible tool on the iPad pro. But each time I import the picture into Vectornator (as new document or via insert photo), it reduces the resolution as well as the other programs, so that I can not redraw the lines accurately. Is there a possibility to change that behaviour?
PS: This is what the source material looks like:
And this is what Vectornator makes of it: