| 摘要 |
PROBLEM TO BE SOLVED: To quantitatively integrate abundant gradation and color tone by applying gradation conversion to a light quantity and adjusting the color tone simultaneously, based on a specific graduation conversion equation as image information of a color original. SOLUTION: A detection section 2 uses a characteristic curve of a recording medium from continuous gradation image information of a color original to detect a light quantity X from a density D. A color separate section 3 corrects the color and separates the information into each of C, M, Y, K color components. A gradation control section 4 obtains a gradation intensity Xn by using the following gradation conversion equation from the luminous quantity Xn of an optional color point (n) by each color; yn =yH +[α(1-10<-> KX).(yS-yH)/(α-β)], where yH, yS are respectively gradation intensity preset for an H part (highlight part) and an S (shadow part),αis an image medium surface reflectance,β=10<-r> ,γis an optional coefficient and K=γ/(XS-XH). A color tone management point M1 is set to a prescribed intermediate position between the H part and the S part by the gradation conversion section 4, in which a desired color tone condition is decided by the gradation intensity.
|
