This is a tool for finding the most perfectly fitting frames and mat dimensions of an image that needs a frame.
Enter the width and height of your image and then hit calculate.
The software will then present a list of available frame sizes ordered so the most perfectly fitting frame will be presented first.
Ideally the software tries to keep the left, top and right sides of the passepartout equally large. The passepartout sides is presented beside each frame size for you to be able to see what options there are.
In the resulting page:
When (w [!h!/]