ABSTRACT
Neutral-exposure characteristic curves are informative about the contrast and sensitometric speed of a product and the presence or absence of contrast and speed balance, but those obtained from exposures to the primary colours can be useful. The major differences between the processing of conventional black-and-white and of colour tripack films arise because of the need in the latter case to generate precisely the required amounts of the image dyes in all the layers. Developer-soluble couplers can only be used when a single dye is to be formed in a colour development stage. Couplers incorporated in the emulsions are used to form all image dyes in one colour development step. Colour print materials have characteristic curves similar to those of black-and-white print materials, as the tone reproduction requirements are quite similar. The demand for high film speeds and improved quality has led to important developments in the technology of colour film assembly.
