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1. (WO2018160883) COLOR SATURATION ADJUSTMENT IN NON-UNIFORM COLOR SPACE
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CLAIMS

1. A machine implemented method of saturation-adjusting one or more images, the method comprising:

receiving an image encoded in an enhanced dynamic range format associated with a second colour space, the image comprising a plurality of pixels, each of the pixels having an intensity component and two chroma components;

receiving colour grading metadata associated with the image, the colour grading metadata comprising a plurality of saturation control values corresponding to respective different hues, the plurality of saturation control values i) representing a desired saturation adjustment and ii) defining a first plurality of hue regions of a first colour space, the first colour space being different from the second colour space;

for each pixel of the plurality of pixels,

determining the pixel's hue and saturation from its two chroma components, determining a pixel saturation adjustment in accordance with the desired saturation adjustment, wherein the plurality of saturation control values have different contributions to the pixel saturation adjustment depending on the location of the respective pixel's hue relative to a second plurality of hue regions in the second colour space, the second plurality of hue regions corresponding one-to-one to the first plurality of hue regions, and

applying the pixel saturation adjustment to the pixel's saturation; and outputting a colour-graded image in the enhanced dynamic range format, the colour-graded image comprising the saturation-adjusted plurality of pixels.

2. The method of claim 1 wherein said determining each of the pixel saturation adjustments comprises locating, within the second colour space, in dependence on the respective pixel's intensity, at least one hue region of the second plurality of hue regions.

3. The method of claim 2 wherein said determining each of the pixel saturation adjustments comprises determining that the respective pixel's hue lies within the at least one hue region.

4. The method of claim 3 wherein, in said determining each of the pixel saturation adjustments, only a subset of the saturation control values have non-zero contributions to the pixel saturation adjustment, the subset of the saturation control values corresponding to hues which bound the at least one hue region.

5. The method of any one of claims 2 to 4 wherein said determining each of the pixel saturation adjustments comprises locating the respective pixel's hue within the at least one hue region.

6. The method of claim 5 when dependent on claim 4, wherein the respective contributions to the pixel saturation adjustment of the subset of the saturation control values depends on relative separation distances between the respective pixel's hue and the hues corresponding to the subset of the saturation control values.

7. The method of any one of claims 2 to 6 wherein said locating, within the second colour space, in dependence on the respective pixel's intensity, the at least one hue region comprises:

identifying a chromaticity plane of the second colour space, the chromaticity plane being specific to the respective pixel's intensity; and

locating the at least one hue region in the chromaticity plane.

8. The method of any preceding claim wherein the plurality of saturation control values is a sequence of six saturation control values, corresponding to the hues red, yellow, green, cyan, blue and magenta.

9. The method of any preceding claim wherein each hue region of the first plurality of hue regions is a region of the first colour space which lies between adjacent hues of said different hues.

10. The method of claim 9 when dependent on claim 8, wherein the hue regions of the first plurality of hue regions are a red-yellow region; a yellow-green region; a green-cyan region; a cyan-blue region; a blue-magenta region; and a magenta-red region.

11. The method of any preceding claim wherein each hue region of the second plurality of hue regions is a region of the second colour space which lies between adjacent hues of said different hues.

12. The method of claim 11 when dependent on claim 8, wherein the hue regions of the second plurality of hue regions are i) a red- yellow region; ii) a yellow-green region; iii) a green-cyan region; iv) a cyan-blue region; v) a blue-magenta region; and vi) a magenta-red region.

13. The method of any preceding claim wherein the first colour space is geometrically symmetric in a chromaticity plane thereof.

14. The method of any preceding claim wherein the first colour space is one of: a hue, saturation, value (HSV) colour space; a hue, saturation, lightness (HSL) colour space; or a hue, saturation intensity (HSI) colour space.

15. The method of any preceding claim wherein the second colour space is geometrically symmetric in a chromaticity plane thereof.

16. The method of any preceding claim wherein the second colour space is one of: a Y'CBCR colour space; a YCBCR colour space; an IPT colour space; and an ICtCp colour space.

17. A display management system comprising: an interface for receiving images encoded in an enhanced dynamic range format and metadata associated therewith; and a processing system configured to perform the method of any preceding claim.

18. The display management system of claim 17, wherein the processing system is configured to perform the method of any preceding method claim after performing colour volume mapping.

19. The display management system of claim 17 or claim 18, wherein the processing system is configured to convert the colour-graded image into a format having a different colour space.

20. A computer program comprising computer interpretable instructions which, when executed by a display management system comprising the processing system and an interface for receiving images encoded in an enhanced dynamic range format and metadata associated therewith, configure the processing system to perform the method of any preceding method claim.

21. A non- transitory computer readable medium comprising the computer program of claim 20.