PNG is limited by available memory
Admittedly a niche-case:
On https://github.com/lovasoa/dezoomify-rs there is the paragraph about PNG and
The PNG encoder in dezoomify-rs can create very large images; it is not limited by the available memory on your computer. This format is chosen by default when the image is very large, or its size is not known in advance.
I have a very large picture and using
dezoomify-rs.exe https://tiles.arcanum.com/mercator/europe-18century-firstsurvey/15/{{X}}/{{Y}}
Leads to my RAM running full and the image just aborting and the image not usable. So it seems the paragraph is not entirely correct - or did i miss something? The map/image in question https://maps.arcanum.com/de/map/europe-18century-firstsurvey/?layers=163%2C165&bbox=1286999.2940432588%2C6173024.589068221%2C1360378.8411970278%2C6199357.145312464
I found someone with more RAM that is helping me out, we are curious on how big this image is gonna be.
Indeed, there seems to be an issue on our side.
But downloading at max resolution to PNG is probably not a solution in your case, since you won't find any software that can open such a large PNG. Downloading a lower zoom level, or downloading to IIIF is probably a better idea in your case.
Doesn't using dezoomify-rs without specifying an output filename with the .png extension output a JPEG image file thus requiring the whole image to fit in RAM? @natrius , anyway it looks like dezoomify-rs is not able to correctly download images from arcanum.com.