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The dimensions of standard negative, print, and transparency sizes are called formats. In general, the nominal dimensions of the picture area (e.g., 2¼ inches square) are used for roll, cassette, and cartridge films, while the actual outer dimensio

Reference: 
p. 209
Citation Text: 

The dimensions of standard negative, print, and transparency sizes are called formats. In general, the nominal dimensions of the picture area (e.g., 2¼ inches square) are used for roll, cassette, and cartridge films, while the actual outer dimensions of the material are used for sheet films and print papers.