tailieunhanh - COLOR MANAGEMENT- P5

COLOR MANAGEMENT- P5: ICC White Papers are one of the formal deliverables of the International Color Consortium, the other being the ICC specification itself – ISO 15076: Image technology color management – Architecture, profile format, and data structure. The White Papers undergo an exhaustive internal development process, followed by a formal technical review by the membership and a ballot for approval by the ICC Steering Committee. | 104 Version 4 obtained by converting from Adobe RGB to sRGB using the Adobe RGB profile as the source profile and choosing the colorimetric rendering intent used to make the prints and the v4 sRGB profile as the destination profile and choosing the perceptual rendering intent to sRGB as illustrated in Figure . This may require a two-step process if the software used does not support the selection of different rendering intents for source and destination. 12 Fundamentals of the Version 4 Perceptual Rendering Intent ICC Version 4 differentiates clearly between perceptual rendering and colorimetric rendering so that the applications appropriate for each of these rendering intents are clarified. Improved workflows can be achieved by exploiting these definitions of clarified rendering intent. An understanding of image state concepts will assist in understanding and applying the ICC perceptual rendering intent. A definition of image state can be found in ISO 22028-1 1 . Essentially the image state conveys information content potential pertaining to encoded color information. As color scientists we know that scenes in general have certain extents of color and tone information scanned hard copy originals in general have certain different extents of color and tone information and so on. From this general understanding the image state semantic allows us to categorize encoded color information - based on real-world algorithm and encoding capabilities and constraints. A color object encoded in a particular image state is appropriate for the uses and output modes associated with that image state. Furthermore the concept of image state allows us to clarify our understanding of the image processing relationships between different color information content potentials - that is between different image states for example the fundamental processing required when transforming a scene to an image suitable for reflection print output. In general recently developed color image .