Method and apparatus for producing a corrected image from an original image

摘要

A plurality of reference tone curves are determined in advance. An operator divides an original image into image regions and selects respective reference tone curves (f1(x), f2(x)) for the image regions. The operator designates weight values for the respective reference tone curves. A weighted average of the respective reference tone values is calculated with the weight values to obtain a tone curve which is then employed to convert the gradation of the original image.