| 摘要 |
PROBLEM TO BE SOLVED: To stably estimate a gray balance from image data of an original image recorded on a photo film with high accuracy. SOLUTION: Remaining pixels by excluding (102-110) high saturation pixels from image data of a single film image recorded on a photo film are recognized (112) as gray candidate pixels that are highly possible to be pixels corresponding to a gray part of an object, and each of the gray candidate pixels is weighted in response to a density difference on a highlight-shadow axis (114-118). This processing is repeated respectively to each of a plurality of film images recorded on the same photo film, and on the basis of the distribution of a gray candidate pixel group consisting of gray candidate pixels extracted respectively from a plurality of the film images on an RGB density coordinate, the gray axis representing a gray balance in a density area of each film image for each film image is estimated through linear approximation to set a processing condition of density/color conversion processing (122-134). |
