Pseudo-isochromatic Tables

Pseudo-isochromatic tables are tables that represent an optical xerographic image, each line and section of which has a certain level of light transmission.

The pseudo-isochromatic image is formed in such a way as to achieve high efficiency values ​​for spacer control and improve image brightness. This can be achieved by adjusting the exposure along the x and y axes of the image; causing high contrast lines to have higher exposure and low contrast lines to have lower exposure.

History The method is based on the photometric principle, the method was first used for film control within shooting, then was introduced into general systems. Different camera operators can get very realistic images, but the general problem is that it is not a true isochromatic camera and this can lead to a lot of problems. Sometimes it's white expansion that simply causes one segment of the exposure to be overexposed compared to others.