The size of a photo is usually in inches, which is different from the diagonal length used by products such as monitors to express the size. "A few inches" in the photo refers to the inch length of one side of the photo, 1 inch ≈2.54 cm. X-inch photos are long-side x-inch photos. For example, the length of a 5-inch photo is 2.54×5 = 12.7cm, and the length of a 12-inch photo is 2.54× 12 = 30.5cm.

Digital cameras usually take 4:3 photos (the same as the display scale), and the enlarged photos are generally about 3:2 (the same as the length and width ratio of the negative). Therefore, when digital cameras enlarge photos, they usually reduce the photo ratio to about 3:2.

Extended data:

Precautions for taking pictures:

1, the head and body should not be in a straight line. If you are in a straight line, you will inevitably feel stiff. Therefore, when the body faces the camera, the head should turn slightly to the left or right, and the picture will look beautiful and vivid; Similarly, when the subject's eyes are facing the camera, turning his body to a certain angle will make the picture look vivid, energetic and increase the three-dimensional sense.

2. Don't parallel your arms and legs. No matter whether the photographer is sitting or standing, don't make his arms or legs parallel, because it will make people feel stiff and mechanical. The appropriate way can be that a song always forms a certain angle or both.

3. Try to make the body shape curve clear. It is necessary for female photographers to show charming curves. The usual method is to let one leg support the weight of the whole body. The other leg is slightly raised and leans against the standing leg. Turn your arm to expose the narrowest side. The chest is bent through the waist to show its height and fullness. At the same time, the hand of the character can be placed on the hip to provide the necessary width for the picture.

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