A4 Landscape

A4 landscape is a paper size that is used for a wide range of documents, including magazines, catalogs, letters and forms. A4 landscape measures 297 × 210 millimeters or 11.69 x 8.27 inches. In PostScript, its dimensions are rounded off to 595 × 842 points. Folded twice, an A4 sheet fits in a C6 size envelope (114 × 162 mm). A4 is part of a set or range of page sizes, called the ISO A or ISO 216 standard. This international standard is based on the German DIN 476 standard from 1922. A4 is actually often referred to as DIN A4. The Japanese have adopted the same range of paper sizes in their JIS P 0138-61 standard. By folding an A4 landscape in two along its shortest side, you create an A5 document. Two A4 landscape pages next to each other in a spread equals the A3 paper size. This way a range of paper sizes is created from A0 (which has a surface of one square meter) to A10. The height/width ratio remains constant for all sizes: 1:1.41 or the square root of 2. The dimensions always get rounded to the nearest millimeter. Resolution needed to print an A4 landscape size picture: To output an image properly it needs to have a certain minimum resolution. The number of pixels depend on the required output quality. 1. At 300 ppi (pixels per inch) the image needs to be 2480 x 3508 pixels. This is the required resolution for quality offset printing that will be viewed from a short distance (such as books, brochures, magazines, calenders,…). For photo books it is also the optimum resolution but a somewhat lower pixel count (250 dpi) is acceptable for great looking photographs. 2. At 150 ppi the image needs to be 1240 x 1754 pixels. This is the minimum resolution for newspapers or posters viewed from a fairly short distance.

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