I made a somewhat strange discovery while developing my ExportImages script. It's that Vectorworks always produces differently sized images when rendering raster images. Most of the time, this only makes up a few pixels. But I still wonder why this is the case and if it can be prevented. For certain images, a pixel-exact export is necessary, if no changes should be visible during later layouts, e.g. in Indesign. Here's the thread where we found the issue: