Extending the dynamic range and adjusting the color characteristics of a digital image

摘要

A method of extending the dynamic range and transforming the color appearance of a digital image includes receiving a source digital image from a capture medium wherein the source digital image includes a plurality of pixel values relating to at least three basic colors. The method further includes calculating a color correction transform by using a non-linear contrast function that is independent of the source digital image and which can be used to extend the dynamic range of the source digital image by correcting an under-exposure condition as a function of the capture medium; and a non-linear color adjustment function which can be used to correct color reproduction errors as a function of exposure associated with an under-exposure condition as a function of the capture medium; and using the color correction transform and the source of digital image to produce an extended dynamic range digital image.