Hi Marco, you have to use V4, images of these sizes will very easily exceed the 32-bit memory limit that V3 has.

Once you use V4 you should find that you can increase the "Canvas megapixel resolution" by quite a bit. I got 20322 x 12303 by using 250 for that value and that was pretty much the limit on my 16GB system and there was some swapping.

You probably won't need to mess with your paging file with 32GB memory, and yes MaxProcessMemoryUseGB= (just blank) is correct. That's the default and means no limit set for memory use.

Don't increase the Canvas megapixel resolution by too much in one step because if you set it high enough to consume all your system memory your system can become pretty sluggish. Increase it in steps of say 50 at a time until you reach the size you want.

But definitely you'll need V4 for doing this. V3 actually has an internal limit of 75.0 for the Canvas resolution.

- Michael