Aspect Ratio is a measurement of a photograph’s width to height. Commonly, 35 mm film measures 36:24, creating an aspect ration of 3:2. Such an aspect ratio tends to produce 6″x4″ printed pictures. Although aspect ratios are a central descriptor in photography, they are also important in cinema and computer technology.
Aspect ratios for different mediums have specifically lettered prefixes to distinguish them. “H” represents the prefix for HDTV aspect ratios; “C” stands for standard, or ‘classic’, aspect ratios; “P” indicates panoramic aspect ratios. While “H” is the prefix used for television, both “C” and “P” can be used for photographic aspect ratios.
It is important to know a film’s aspect ratio because varying ratios may not conform clearly to certain photo print sizes. Therefore, if you want to print a photograph at a specific size, you should examine an aspect ratio chart to assess what aspect ratio for film that you will need so that the image shows up clearly.
If you attempt to print photographs that don’t conform to the film’s aspect ratio, the photo printer will either pad the picture’s edges (i.e. by adding a border) or crop the photo’s top and/or sides. By altering the shape of the print, the photo printer can maintain the integrity of the image.
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