Patent ID: 7272257

Claim:
A different-color-structure photographic image determination method comprising: a first step of determining whether a target film image is a photographic image photographed by different types of light sources based on RGB component data on each of pixels that constitute data on the target film image; a second step of developing data on the target film image so as to correspond to a predetermined X-Y two-dimensional coordinate system representing a relationship between a minimum of the RGB component data on the each pixel and the RGB component data for the minimum if it is determined in the first step that the target film image is the photographic image photographed by the different types of the light sources; and a third step of operating and deriving, from the data developed in the second step, an average of dissociations of the respective pixels that constitutes the data on the target film image relative to a reference line representing characteristics of a film image photographed by a standard light as a minimum difference sum at least for each pixel group of R, G, or B, wherein if the minimum difference sum for the pixel group of the R, G, or B operated and derived in the third step is greater than a predetermined reference value, it is determined that the target film image is a photographic image of a structure having different colors.