I'm using Artrage 5 on a Microsoft Surface Pro 4. I love using the Surface Pen with this program!

My problem is I needed to increase a project to a working size at 18' width at 150 dpi. I tried to edit/Resize Painting/Print Size Tab, then change the width inches to 216 and dpi to 150, with the Preserve Aspect Ratio button checked. Everything looked good so I hit the OK button, but when I went back to check it, the width had decreased to 213.33 inches. The height was still ok, so it looks like Artrage changed my aspect ratio! I noticed before the OK button, the screen width said 32400 pixels, but afterwards, it changed to 32000, so it shrank my drawing with by 400 pixels. Not the height, just the width. I wish there was a dialog box that warned me it was going to do that.

So now, unless there's another solution within Artrage, my fix will be to work with the drawing in Artrage at a lower dpi, then changing the dpi using another program.