Set window back color, show msg, and OK button. It took several years for film and print size standardization to take place and, in fact, many film sizes continue to exist today.
Aspect ratio is the ratio of the larger dimension of a rectangle to the smaller dimension.
You may have heard this term used to describe the format of a movie screen, television screen, or other video output. This film measurement is important to photographic composition, as you will soon see. So, to produce an image with a 35mm aspect ratio, the sides are cropped. Learn more about cropping an image in the next section. Photo by Martha Hoffman.