The Human Visual Response of Stochastic Screens

The finite resolution of the human visual systems should be taken into account when assessing the performance of different printing technologies. In binary image printing the result should be evaluated with respect to the characteristics of the observer and the viewing conditions. So far, much of the interest in this area has been focused on low-end printers with a resolution of typically 300 dpi. In this resolution range artefacts are still a serious problem. This paper aims at establishing the printing resolution range that balances the problem artefacts and the requirement of printing small dots. The results are based on a model for the modulation transition function of the visual system and the notion of just noticeable colour difference.