Transforms for digital images in linear form

摘要

A method which substantially maintains the exposure latitude contained in one or more digital images captured in linear form and which uses an output device with a predetermined aim curve for producing visual images from such digital image includes the steps of selecting a particular reference portion of the scene corresponding to the digital image and adjusting the code value of such reference portion to a code value corresponding to a desired density and which corresponds to a point on the aim curve and changing the remaining code values of the digital image based upon the selected code value of the point on the aim curve so that a new digital image in linear form is produced; transforming the new digital image to form a third digital image which has code values based on the aim curve; and producing visual images by the output device in response to the transformed third digital image.