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In the US, size names are often denoted with a code of the format nR, where the number n represents the length of the shorter edge in inches. In the normal series, the long edge is the length of the short edge plus 2 inches (10 in or less) or 3 inches (11 in and above).
The 6 × 6 cm image size was the classic 1:1 format in the recent past. 120 film can still be found and used today. Many Polaroid instant films were designed as square formats. Furthermore, up until August 2015, photo-sharing site Instagram only allowed users to upload images in 1:1 format.
The 7264×5440 pixel sensor measures 44 mm × 33 mm, which is less than 63% the size of a 6×4.5 cm film image but over 168% of a full-frame DSLR. Unlike other medium-format DSLRs, which accept digital camera backs of different resolutions or even manufacturers, the 645D has a fixed-back design similar to smaller full-frame and APS-C DSLRs.
The most common aspect ratios are 6×6 cm (square/1:1) and 6×4.5 cm (rectangular/4:3). Other frequently used aspect ratios are 6×7 cm, 6×9 cm, and 6×17 cm panoramic . The 6×4.5 cm format is usually referred to as "645", with many cameras that use this ratio bearing "645" in their product name.
Many image formats are native to one specific graphics application and are not offered as an export option in other software, due to proprietary considerations. An example of this is Adobe Photoshop 's native PSD-format (Prevention of Significant Deterioration), which cannot be opened in less sophisticated programs for image viewing or editing ...
List of digital video cameras with an image sensor larger than 2/3 inch and producing video in a horizontal resolution equal or higher than 1920 pixels. Digital video cameras [ edit ]