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2. Enlarger - Wikipedia

   en.wikipedia.org/wiki/Enlarger

   For example, an enlargement from a certain negative as a 12 x 18 cm (approx. 5 by 7 inch) print may be sufficient for a scrapbook viewed at 50 cm (20 inches), but insufficiently detailed for an A4 print hung on a hallway wall to be viewed at the same distance, though usable at a larger 120 x 180 cm (ten times larger) on a billboard to be viewed ...

3. Carte de visite - Wikipedia

   en.wikipedia.org/wiki/Carte_de_visite

   Each photograph was the size of a formal visiting card about 4 1/2 x 2 1/2 inches (11.4 x 6.3 cm) [1] and such photograph cards, in an early form of social media, [2] were commonly traded among friends and visitors in the 1860s. Albums for the collection and display of cards became a common fixture in Victorian parlors.

4. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

5. Solar camera - Wikipedia

   en.wikipedia.org/wiki/Solar_camera

   Often made life-size from a carte-de-visite negative 54.0 mm × 89 mm (2.13 in × 3.50 in) or, in an extreme case, enlarged 15x from 2.54 cm (1-inch) -square glass plates of the 'Pistolgraph' camera invented in 1859 by British photographer Thomas Skaife (1806–1876), the enlargement ratios were often considerable.

6. Large format - Wikipedia

   en.wikipedia.org/wiki/Large_format

   The most common large format is 4×5 inches (10.2x12.7 cm), which was the size used by cameras like the Graflex Speed Graphic and Crown Graphic, among others. Less common formats include quarter-plate (3.25x4.25 inches (8.3x10.8 cm)), 5×7 inches (12.7x17.8 cm), and 8×10 inches (20×25 cm); the size of many old 1920s Kodak cameras (various versions of Kodak 1, 2, and 3 and Master View cameras ...

7. Comparison gallery of image scaling algorithms - Wikipedia

   en.wikipedia.org/wiki/Comparison_gallery_of...

   An image size can be changed in several ways. Consider resizing a 160x160 pixel photo to the following 40x40 pixel thumbnail and then scaling the thumbnail to a 160x160 pixel image. Also consider doubling the size of the following image containing text.