Resizing cards in sheets

[msoucy]

I'm attempting to use a tool with a strict 4096x4096 pixel requirement for sheets. When I was attempting to resize cards, I ran into issues with various combinations of width, height, and dpi. I would have expected that bringing DPI down would have reduced the overall size, but instead it seems to have resized elements of the cards but kept the overall image size the same.

Is there a built in way to scale the entire card? I've been using Imagemagick as a postprocessing step, but would prefer something built in.

EDIT: It looks like #183 addresses a similar, but not identical, issue.