| 摘要 |
A digital image photographing apparatus includes: a histogram calculating part for calculating a histogram of an inputted original image; a histogram value setting part for selecting an upper range in a first ratio in the histogram to set a lowest limit value as a maximum brightness value of the original image, and selecting a lower range in a second ratio to set a highest limit value as a minimum brightness value of the original image; a parameter setting part for setting a minimum brightness value of a processed image to a value less than the minimum brightness value of the original image, and setting a maximum brightness value of the processed image to a value greater than the maximum brightness value of the original image; and a histogram stretching part for stretching the histogram of the original image with reference to the maximum and minimum values of the processed image.
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