Monitoring element for image-transmitting methods, in particular for reproduction engineering and printing engineering

摘要

The invention relates to a monitoring element for image-transmitting methods, in particular for reproduction engineering and printing engineering, consisting of a support material (e.g. test film) having wedge-shaped lines and slits. Because of undercutting effects, dimensional changes to the pixels (e.g. raster points) occur during image transmission. These changes in dimension - which have the effect of changing tonal values - can be measured by means of suitable microscopes, but this is very troublesome for production, complicated and time consuming. The monitoring element of the type according to the invention permits simple, rapid, reliable and continuous measurement and evaluation of the changes in dimension of the pixels to be transmitted, as well as of the dissolving power, the scattering behaviour and the exposure latitude of transmission techniques and information receivers. Depending on the type and extent of the undercutting effects, the wedge-shaped lines and slits are reproduced differently, as a result of which it is possible to derive a measure of the changes in dimension. The changes in length of the wedge-shaped lines occurring due to undercutting effects lead to changes in tonal value which are clearly perceptible visually, as a result of which microscopic enlargements are rendered superfluous; the values can be read off even with the naked eye, but at least using a magnifying glass or a filament counter.