Why a3 paper size

Two A3 pages next to each other in a spread equals the A2 paper size. This way a range of paper sizes is created from A0 which has a surface of one square meter to A The dimensions always get rounded to the nearest millimeter. To output an image properly it needs to have a certain minimum resolution. The number of pixels depend on the required output quality. A digital camera with decent image quality and a resolution of 12 megapixels or more can be used to print high-quality A3 size pictures.

Since pictures of this size are usually viewed from a somewhat larger distance an 8-megapixel camera will still offer excellent quality. In the American market, ISO paper sizes are hardly used at all. The dimensions of the A series paper sizes, as defined by the ISO standard, are given in the table below the diagram in both millimetres and inches cm measurements can be obtained by dividing mm value by The A Series paper size chart, below left, gives a visual representation of how the sizes relate to each other - for example A5 is half of A4 size paper and A2 is half of A1 size paper.

To obtain paper sizes in centimetres, convert mm values to cm by dividing by 10 and in feet by dividing inch values by More units here and sizes in pixels here. Some booklets, for example, may require a paper size that sits between a standard A4 and A5.

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