Tone Reproduction in Halftone Negatives.

In all halftone work it is customary to combine several exposures - for instance, a highlight, a detail, and a flash exposure. The effect of these combined exposures on tone reproduction has only been understood in a qualitative way. Formulas for predicting the resulting tone reproduction curve quantitatively have now been worked out, and are shown to check well with experimental results. Based on this theoretical work, a new and more accurate system of exposure determination for halftone negatives has been worked out, and an exposure guide has been designed. Methods of control of tone reproduction with the magenta contact screen by highlighting exposures and still development will also be described.