Measuring a picture
You may want to measure vertically and horizontally as shown on left. Alternatively, it might be a good idea to get some paper and cut out an oval shape based on the standard sizes and hold it over the picture to see how it looks. Don't forget to subtract a little for the lip, which is approximately 5/16 inch plus or minus. Be careful not to damage your picture! Also, it would be a big mistake to cut into your picture until you actually receive your frame.