Secondary color modification of a digital image

A method of determining output chromas from one or more chroma parameter sets, each chroma parameter set including a set of one or more chroma region parameters indicative of a chroma region and a corresponding set of one or more chroma modification parameters indicative of a chroma modification, the method comprising acts of:

• for a first chroma parameter set including a set of chroma region parameters and a set of chroma modification parameters, determining at least one of either the chroma region parameter set or the chroma modification parameter set from one or more chromas selected from a chroma source;
• receiving the one or more chroma parameter sets, including the first chroma parameter set;
• determining, for each chroma parameter set, a chroma region of a first chroma plane corresponding to the chroma region parameters, the chroma region defining a range of chromas of the chroma plane for which a chroma modification is to be applied;
• determining, for each chroma parameter set, the chroma modification to be applied to chromas in the chroma region;
• and
• for each chroma of the chroma plane, determining an output chroma based on the one or more determined chroma regions and the one or more determined chroma modifications corresponding to each chroma region.

A method of determining output chromas from one or more chroma parameter sets, each chroma parameter set including a set of one or more chroma region parameters indicative of a chroma region and a corresponding set of one or more chroma modification parameters indicative of a chroma modification, the method comprising acts of:

• receiving the one or more chroma parameter sets;
• determining, for each chroma parameter set, a chroma region of a first chroma plane corresponding to the chroma region parameters, the chroma region defining a range of chromas of the chroma plane for which a chroma modification is to be applied, wherein at least one of the determined chroma regions has a shape of an ellipsoid;
• determining, for each chroma parameter set, the chroma modification to be applied to chromas in the chroma region;
• and
• for each chroma of the chroma plane, determining an output chroma based on the one or more determined chroma regions and the one or more determined chroma modifications corresponding to each chroma region.