A presentation detailing the exact measurements of the A3 paper, how this was decided and what types of projects it is suited for.

1. Facts about A3 paper--
Its size dimensions, usage and a bit of history

2. A3 paper is part of the ISO 216 standard used all over the world. It is one of
the more popular paper formats used internationally. The A3 paper is also
now supported by most printer and computer software programs.

3. The dimensions of an A3 paper are 297 × 420
millimetres or 11.69 × 16.54 inches.
In PostScript, its dimensions are rounded off to
842 × 1190 points. Its printing surface
including margins is 394 x 257 millimetres.

4. The ISO 216 standard is based on the principle that
when you fold any size paper in half it will still retain
its aspect ratio of the square root of two.
By cutting an A3 paper in half in its shortest side you
will produce an A4 paper. When you fold two A3
papers next to each in a spread it will result to an A2
paper.
The practical and aesthetic advantages of the square root of
2 aspect ratio for paper sizes were probably first noted by
physics professor Georg Christoph Lichtenberg, reinvented
over a hundred years later in Germany by Dr. Walter
Porstmann.
They were adopted as the German standard DIN 476 in 1922
to replace the huge variety of other paper sizes in use until
then, and to make paper stocking and reproduction methods
cheaper and more efficient.

5. The A3 paper format is used for activities in projects that need a large paper
space to write, draw or paste all the details. Many presentations, charts and
enlargements use A3 paper. It is also used by artists to render large drawings
and by architects to draw up their construction plans and structure outlines.
In the fashion world, designers use it to render their designs for clothes and
costumes with elaborate details. Some map makers also prefer A3 paper when
they want a map format that is neither too small to show streets nor too large
for the bearer to handle it easily and conveniently.

6. When printing a picture on A3 size, the image will need to meet a certain
minimum resolution
At 300 ppi the needed image resolution is 3508
x 4961 pixels. This is best for viewing images
on a close distance as in coffee table books,
calendars, magazines, brochures, etc. Photo
books on the same resolution will work fine
on a lower pixel count of 250. These
dimensions are acceptable for producing
good quality images.
At 150 ppi the pixel count has to be 1754 x
2480. This is ideal for viewing images on a
fairly short distance as in newspapers and
posters.

7. A digital camera that offers a decent image quality and
has a resolution of at least 8 or 12 megapixels can
already produce A3 size pictures of excellent quality.

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