Digital cameras in general use an aspect ratio of 3:4 and not the classical format of 2:3.As a result, the prints are not exactly 4" x 6" (10 x 15 cm), but have been adjusted to the ratio of the original file. There are two possibilities: The picture can either be "zoomed", but part of the motive will be cut off; or be printed in full, which will result in unattractive white edges. Our technology that produces pictures without "white edges", exposes the whole picture and cuts the paper according to the pictures' size.

Exceptions are, e.g. our 40x60cm (16x24") Super Poster and our 50x75cm (20x30”) Giga-Poster: these posters are always developed to a size of 40x60cm (16x24") and 50x75cm (20x30”), respectively. We therefore highly recommend you to use an image file with an aspect ratio of 2:3.  

… only when the photo is developed at exact pixel size,
can the whole motive appear without white edges.

In order to calculate the exact size your picture will have, simply take the standard format - 9 cm (3.5"), 10 cm (4"), 11 cm (4.5"), 13 cm (5") or 20 cm (8").  Divide this number by the smaller number of your photo camera’s pixel resolution and multiply the outcome by the largest number of your photo camera’s pixel resolution. You will then have the exact dimensions of your picture.

For example:
Your camera has a resolution of 1600 x 1200 pixels.  You wish to develop your photo in 9 cm (3.5") format. In this case, a 9 cm (3.5") picture, according to the following formula, has a size of 9 x 12 cm (3.5" x 4.7") and not 9 cm x 13 cm (3.5" x 5").
 Formula:  9 cm/1200 x 1600 = 12 cm (3.5"/1200 x 1600 = 4.7")

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