Trimming on photos

Please note that for production reasons, 3% overlapping will be developed. Your image will be magnified by 3% at the exposure, leaving a minimal portion of your subject at the edges of the image. In the Saal Design software and in our online shop this area is displayed as a red line.

In both the Saal Design software and the online shop, you can choose between two different settings:

  1. Cropped
  2. Uncropped

1. Cropped
The exact aspect ratio in pixels is the critical size for the scaling and thus for the possible trimming. The DPI number is irrelevant in the section calculation/scaling. For simplicity, here are a few examples: A customer delivers a file with 1808 x 2787 pixels (aspect ratio about 2:3). He would like to print this file in the format 20 x 30 cm (aspect ratio 2:3, actual paper size 20.3 x 30.5 cm). The most important criterion is the shorter page (width of the file) The online print software now takes the file value for the shorter page (paper width) as given and calculates the file value for the longer page in the exact page ratio.


Calculation: 20.3 : 1808 x 2787= 31.29 cm


Formula: Paper width divided by the width of the file in pixels multiplied by the length of the file in pixels = calculated paper length for a given width. The calculated value is now compared with the specified value of the output format. The resulting difference is later visible as a crop of the image file. In this case (calculated file length 31.29 cm / output format 30.5 cm), the image file is cut by approx. 8 mm. Due to the centering of the picture, the trim on the right and left is 4 mm. This calculation can also be somewhat larger in practice since a D-Lab with tolerances of approx. 2% works.

Why is the cropping of the image file on the long side so great?

With an exposure of a 2:3 file (analog format) on a 3:4 output format
Example: The customer with the image size 1808 x 2787 pixel (aspect ratio 2:3) would like to print the output in the format 20 x 27 cm (3:4)

Calculation: 20.3 : 1808 x 2787 = 31.29 cm


Formula:Paper width divided by the width of the image file in pixels multiplied by the length of the image file in pixels = calculated paper length for a given width. Creation of 4.09 cm in total. This corresponds to the difference of 31.29 cm image length with an exact 2:3 format to 27.2 cm length of the output format. Thus, 2.045 cm from the image file are cut off to the right and left.

Why is the cropping of the image file on the short side (image width) so great?
By exposing a 3:4 file (digital format) on a 2:3 output format.

Example: A customer delivers a file with a size of 1574 x 2098 pixels (3:4 digital format) He wants the exposure to 10 x 15 cm. This is a 2:3 format with an actual paper size of 10.2 x 15.2 cm. The software now recognizes that the system applied so far does not lead to a good result and reverses the systematic. It adjusts the longer side of the file to the output format.


Important: Vertical formats are recognized as such and rotated by the software. The possible trimming is solely dependent on the aspect ratio and the selected cropping mode.

2. Uncropped/ White Borders
If the full image mode is selected, the software tries to display the complete image file on the output format. The criterion is the longer side of the file, taking into account the aspect ratio. If you want to have your 3:4 image file exposed to a 2:3 output format, white edges can appear right and left if the long side of your image file does not correspond to the long side of the output format. If the long side of the image file on the long side of the output format fits, it can come to white edges up and down.

Clarification between full screen mode and cut mode
We use the example of the customer who would like an exposure to 20 x 30 cm with a file size of 1808 x 2787 pixels. 1808 x 2787 pixels (aspect ratio about 2:3)


Calculation: 30,5 : 2787 x 1808 = 19,78 cm


Formula: Length output format divided by the length of the image file in pixels, multiplied by the width of the image file in pixels = calculated paper width for a given length. The calculated value is the width corresponding to an exact 2: 3 aspect ratio for a given length of 2787 pixels. The newly calculated image file of 19.78 x 30.5 cm is then exposed on the output format 20.3 x 30.5 cm and white edges are formed at the top and bottom. 

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