two superimposed cards = background of the image

Example of stencil corresponding to the distribution of one color

Example of passage of a color through the stencil

The support of the image is formed by superimposed and moved punch cards so that there are not holes anymore. This process builds a relief grain on the support

Avec le système des pochoirs réalisés en carte perforées, le point coloré de base avait une taille déterminée par la perforation de la carte.