Question: How do I determine my mat border size?
Answer: While there is no mathematical equation, a good rule of thumb is to provide enough border to create a smooth transition from the artwork to the frame so as not to lose the picture among the matting.
Most mats range in width from 1 1/2" for smaller projects (such as an 11" x 14" image) to 4" on projects that measure about 22" x 30". Some people like to make the bottom border a bit larger, to optically-center the artwork.
This is called "weighting the bottom" and was quite common in previous eras. Like many aesthetic aspects of framing, this, too, is your preference.
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