| 摘要 |
A system and method of image reproduction in color with preferential tone mapping and color enhancement are provided in which the method provides a reproduction of an original scene with enhanced color and with a preferential tone mapping, the method comprising: (I) capturing the parameters of the original scene; (II) transforming the original scene parameters, in conjunction with the untransfomed characteristics of the capturing and creating steps, wherein said transforming includes modifying the parameters to create a reproduction which satisfies the following two requirements: (a) the reproduction has a reproduced tone mapping having instantaneous gamma values of viewed reproduction density relative to density of the original scene which are greater than a minimum value of A and less than A plus 0.35 times scene exposure density over a scene exposure density range of from 0.60 to 1.45 as measured relative to a zero density, 100% diffuse reflector in the original scene, the instantaneous gamma values within scene exposure density range further lying entirely within a range of values subtended by an angle of 14 DEG measured from a reference point at 0.0 scene exposure density and a viewed reproduction density gradient of A, wherein A is 1.0 in the case of direct view reflection media reproduction, 1.1 in the case of self-illuminated reproduction for viewing with ambient surround, and 1.3 in the case of a reproduction for viewing with dark surround; and (b) the reproduction has color enhancement wherein a Macbeth Color Checker, if captured in the original scene, would appear in the reproduced image so that (1) the CIELAB chroma ratio is greater than 1/A for at least one of the six high chroma patches, and (2) either the CIELAB chroma ratio for the light skin patch is between 0.8/A and 1.4/A or the CIELAB chroma ratio for the dark skin patch is between 1.0/A and 1.8/A, or the CIELAB chroma ratios for both skin patches are within said ranges, wherein A is as defined in (a) above; and (III) creating a reproduction of the original scene. The CIELAB chroma ratios, which are defined more fully in the description, are the ratios for a given color patch of the CIELAB chroma (c*) of the reproduction prepared in accordance with the prescribed steps to the c* of the original scene. <MATH> |
