A method for processing a sequence of digital image signals in order to match the appearance of a particular display medium, such as a motion picture print film, includes the steps of (a) converting the digital image signals into signal values in an analytical dye amount space where the signal values are proportional to a dye set corresponding to the particular medium; and (b) converting the signal values in analytical dye amount space into output values suitable for a display device, such as a digital projector. Moreover, the signal values in analytical dye amount space may be corrected for viewing conditions, such as printing flare, gamma, contrast ratio or neutrality.
Data on a target film image is developed so as to correspond to a predetermined X-Y two-dimensional coordinate system representing a relationship between RGB average data on each constituent pixel and respective color component data, developed pixels are divided to a plurality of groups so that pieces of the RGB average data on the respective pixels are arranged equidistantly, an average of dissociations of the respective pixels relative to a reference line representing characteristics of a film image photographed by a standard light is operated and derived as a group difference sum for each of the divided groups, for each of R, G, and B, a thickness factor for normalizing a distribution thickness of a pixel distribution in a direction in which the pixel distribution is distanced from the reference line is operated and derived, for each of the divided groups, an image difference sum is operated and derived by a product-sum operation between the group difference sum and the thickness factor, and if the image difference sum for the R, G, or B is greater than a predetermined value, the target film image is determined as a photographic image photographed using different types of light sources.
A method for converting a sequence of electronically captured images into a sequence of modified images for providing the appearance of images captured by a film reproduction system. The film reproduction system being includes motion picture negative film printed onto a motion picture print film that is displayed, or a reversal motion picture system in which the reversal film is displayed, or a motion picture film electro-optically scanned to standard format video by a telecine and further displayed, or a motion picture film electro-optically scanned by a scanner suitable for producing digital data intended for additional digital image manipulation. A digital master is prepared from the aforementioned film formats for electronic distribution or recording out to another film to be used as a printing master for producing distribution optical prints for theatrical projection.
