Method and system using gamut mapping templates to derive actual color gamut mapping
A mapping method, program, and device provide an explicit mechanism for the user to control the gamut mapping. Specifically, hints in the mapping are set by the user to influence the outcome of the mapping and achieve the desired result. In effect, the gamut mapping is defined by example. The mapping may be defined relative to a reference gamut and specifically, the mapping is created by defining reference points in the gamut. Most often, these reference points are in the lightest and darkest regions of the mapping. Alternatively, areas of the purest color can also be used as the locations for providing the hints. Further, color combinations, such as cyan plus magenta, cyan plus yellow, cyan plus blue, blue plus yellow, blue plus magenta, and yellow plus magenta, and 100% of the corresponding colorants are added to the list of hints. Then, the mapping is defined relative to those points.
1 . A method for gamut mapping, comprising:
defining hints describing a gamut mapping to a reference color space to create a template gamut map; and
using the template gamut map to create a target gamut map to a target device color space of a target rendering device.
2 . A method as claimed in claim 1 , further comprising:
picking a reference gamut; and
defining the template gamut map relative to the reference gamut.
3 . A method as claimed in claim 1 , wherein the hints are added to the template gamut map.
4 . A method as claimed in claim 1 , wherein the hints specify color mapping in the template gamut map.
5 . A method as claimed in claim 1 , wherein the hints specify color mapping for darkest regions of the template gamut map.
6 . A method as claimed in claim 1 , wherein the hints specify color mapping for lightest regions of the template gamut map.
7 . A method as claimed in claim 1 , wherein the hints specify color mapping for at least one point of purest color of the template gamut map.
8 . A method as claimed in claim 1 , wherein the hints specify color mapping for all points of purest color of the template gamut map.
9 . A method as claimed in claim 1 , wherein the hints specify color mapping for saturation of cyan+magenta or cyan+yellow or cyan+black or black+yellow or black+magenta or yellow+magenta.
10 . A method as claimed in claim 1 , wherein the step of using the template gamut map comprises:
finding a color gamut of the target rendering device; and
converting the target device color gamut to a color space of the template gamut map.
11 . A method as claimed in claim 10 , wherein the step of using the template gamut map further comprises:
replacing a reference gamut, used to create the template gamut map, with the target device color gamut; and
completing target device gamut mapping using the hints.
12 . A method as claimed in claim 11 , further comprising inverting the target device gamut mapping and using the inverted gamut mapping to convert a source image data to target device image data in a color space of the target device.
13 . A gamut mapping template comprising hints describing a gamut mapping to a reference color space.
14 . A gamut mapping template as claimed in claim 13 , wherein the hints are added to the template gamut map.
15 . A gamut mapping template as claimed in claim 13 , wherein the hints specify color mapping in the template gamut map.
16 . A gamut mapping template as claimed in claim 13 , wherein the hints specify color mapping for darkest regions of the template gamut map.
17 . A gamut mapping template as claimed in claim 13 , wherein the hints specify color mapping for lightest regions of the template gamut map.
18 . A gamut mapping template as claimed in claim 13 , wherein the hints specify color mapping for at least one point of purest color of the template gamut map.
19 . A gamut mapping template as claimed in claim 13 , wherein the hints specify color mapping for all points of purest color of the template gamut map.
20 . A gamut mapping template as claimed in claim 13 , wherein the hints specify color mapping for saturation of cyan+magenta or cyan+yellow or cyan+black or black+yellow or black+magenta or yellow+magenta.
21 . A computer software product for gamut map editing, the product comprising a computer-readable medium in which program instructions are stored, which instructions, when read by a computer, cause the computer to enable user definition of hints describing a gamut mapping to a reference color space to define a template gamut map that is used to create target gamut map to a target device color space of a target rendering device
22 . A product as claimed in claim 1 ,wherein the product enables user selection of a reference gamut and definition of the template gamut map relative to the reference gamut.
23 . A product as claimed in claim 1 , wherein the hints are added to the template gamut map.
24 . A product as claimed in claim 21 , wherein the hints specify color mapping in the template gamut map.
25 . A product as claimed in claim 21 , wherein the hints specify color mapping for darkest regions of the template gamut map.
26 . A product as claimed in claim 21 , wherein the hints specify color mapping for lightest regions of the template gamut map.
27 . A product as claimed in claim 21 , wherein the hints specify color mapping for at least one point of purest color of the template gamut map.
28 . A product as claimed in claim 21 , wherein the hints specify color mapping for all points of purest color of the template gamut map.
29 . A product as claimed in claim 21 , wherein the hints specify color mapping for saturation of cyan+magenta or cyan+yellow or cyan+black or black+yellow or black+magenta or yellow+magenta.