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2. Aspect ratio (image) - Wikipedia

   en.wikipedia.org/wiki/Aspect_ratio_(image)

   The aspect ratio of an image is the ratio of its width to its height. It is expressed as two numbers separated by a colon, width:height. Common aspect ratios are 1.85:1 and 2.40:1 in cinematography, 4:3 and 16:9 in television, and 3:2 in still photography .

3. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   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 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 ...

4. Portraits of presidents of the United States - Wikipedia

   en.wikipedia.org/wiki/Portraits_of_presidents_of...

   The official White House portrait of Barack Obama was unveiled on September 7, 2022. It was painted by Robert McCurdy, who focused on working off of a photograph of the former president. In the photorealistic portrait, Obama is dressed in a black suit with a gray tie, and painted against a minimal white backdrop, a signature of McCurdy's artworks.

5. Color temperature - Wikipedia

   en.wikipedia.org/wiki/Color_temperature

   Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective body. The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source.

6. Amsler grid - Wikipedia

   en.wikipedia.org/wiki/Amsler_grid

   Chart 1 is the basic version, which is the most familiar and widely used chart among all the charts. In this chart the grid consists of 0.5 cm squares (each for 1° visual field), which totally measures 10 cm X 10 cm size. Most commonly grid is in white color with black background. [3]

7. Lansdowne portrait - Wikipedia

   en.wikipedia.org/wiki/Lansdowne_portrait

   The Lansdowne portrait is an iconic life-size portrait of George Washington painted by Gilbert Stuart in 1796. It depicts the 64-year-old president of the United States during his final year in office. The portrait was a gift to former British Prime Minister William Petty, 1st Marquess of Lansdowne, and spent more than 170 years in England .

8. List of common display resolutions - Wikipedia

   en.wikipedia.org/wiki/List_of_common_display...

   16:9. 8,294,400. 7680 × 4320. 8K UHDTV. 4320p. 33,177,600. Many of these resolutions are also used for video files that are not broadcast. These may also use other aspect ratios by cropping otherwise black bars at the top and bottom which result from cinema aspect ratios greater than 16∶9, such as 1.85 or 2.35 through 2.40 (dubbed ...

9. Book size - Wikipedia

   en.wikipedia.org/wiki/Book_size

   The size and proportions of a book depend on the size of the original full sheet. If a sheet 480 by 640 mm (19 by 25 in) is used to print a quarto, the resulting untrimmed pages, will be approximately half as large in each dimension: width 240 mm ( 9⁄ in) and height 320 mm ( 12⁄ in). An octavo page, oriented a quarter turn from the full ...