PROCESS FOR INVESTIGATING TRANSPARENT WEBS, ESPECIALLY PHOTOGRAPHIC PAPER SUPPORTS

The invention relates to a process for visually monitoring the formation of web-shaped, transparent material moving relative to the device, having a device which comprises a light source (5) on one side of the web (1), with which a light flux of desired colour and intensity which penetrates the web is generated, and a camera (10) on the side of the web opposite the light source, which intercepts the light flux penetrating the web and converts it into a video signal which can be fed to a video monitor unit with a display screen. Especially for the purpose of examining paper and cardboard for photographic purposes, the light source (5) transmits the light flux in each case as a flash of light with an exposure time t1 that is to be dimensioned so short that during the exposure time the feed of the web (1) is below the limit which renders the image unsharp in terms of motion, that the image is intercepted by the camera (10), and that a visible image to which a comparative image is visually assigned is generated on the display screen of the video monitor unit.