How to Measure a Picture Frame & Matting

CreativePF [1114bk-w] Collectors Edition Sports Illustrated Frame, Displays 1971-1980 Magazines Measuring 8 1/2 by 11 1/4-inches with White Mat (Measure Your Magazine)

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Measuring for Mats

What is the cardboard inside a picture frame called?

Frame, Matte and Print size explained, Pixel v. Ink, Blog