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Various resolutions and their relationships

The resolution of colour and greyscale pictures should be twice the desired screen ruling. In other words, when printing with screen ruling 60 lines per cm, the image resolution should be 120 pixels per centimetre or 300 dpi. In scanning it is advisable to even higher values for the image to endure more stripping and manipulation.

On the monitor screen a 1:1 image is fairly large because of the low resolution of the monitor. A 300 dpi picture is shown more than four times larger in order for a 72 dpi screen to be able to reproduce all pixels.The resolutions of imagesetters and platesetters are very high, even 2000 to 5000 dpi. The higher the resolution, the more greyscale levels can be reproduced; however, even for this an optimal value can be calculated.