| 摘要 |
A photograph image-processing method, comprising steps of entering a film image (10a) by reading a film image (10a) by an image pickup device (116) and generating color image data, generating concentration histograms for each of RGB color components from the color image data, relative-stretch-processing the concentration histograms, calculating and deriving a relative stretch ratio which maximizes the RGB superimposed area which has undergone relative-stretch processing, calculating and deriving an evaluation value of reliability with respect to the relative stretch ratio, calculating and deriving a correction stretch ratio based on the evaluation value, and conversion-processing RGB components of each pixel of the color image data in accordance with the correction stretch ratio.
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