My OmniGraffle file contains an image of an exact size (3075x2250 pixels) with no stroke. When I try to export it as a PNG at 300 dpi, I get 3154x2308. I need the output to have the exact pixel size specified, but no amount of tweaking the resolution (which must be an integer) allows me to do this.
Is this a bug? (If so, judging by old forum posts, it has been around for nigh on a decade.)
Is there a workaround?