Output frequency

In the field of printing technology, the output frequency corresponds to the resolution of the image data. It indicates how many pixels per unit of length (for example cm) were digitized.

For multicolored offset printing with a screen frequency of 60 dots per cm (corresponds to 150 dots per inch), the output frequency should be 300 dots per inch, with 4 pixels (2 in each direction) for the generation of the screen dot. In the case of black-and-white images, the need for a detailed display results in output frequencies of up to 2400 points per inch. Depending on the necessary changes in the scale of the original for reproduction, the necessary resolutions in the scanner are also significantly higher or lower.

• Example: With a scale of 200%, the same output frequency must be scanned with twice the resolution in order to obtain the same detailed information from the original. If the scale is less than 100%, the resolution is reduced accordingly.