Colour optimisation for direct view

A method of displaying a color image, the method comprising:

• receiving an image for projection, wherein the image is a color image comprising a first color component and a second color component, and
• calculating a first hologram of the first color component and a second hologram of the second color component;
• wherein the method further comprises:
• adding content of the second color component to the first color component before calculating the first hologram such that the first hologram contains information of the first color component and information of at least a portion of the second color component;
• reducing content of the second color component in correspondence with the content of the second color component added to the first color component;
• and
• forming a first holographic reconstruction by illuminating the first hologram with first color light and forming a second holographic reconstruction by illuminating the second hologram with second color light, wherein the first holographic reconstruction and second holographic reconstruction are formed at substantially the same time such that the first holographic reconstruction changes a chromaticity of the at least a portion of the second color component so as to reduce an amount of light of the second color in the first and second holographic reconstructions.

A tangible, non-transitory computer-readable medium comprising program instructions, wherein the program instructions, when executed by one or more processors, cause a system to perform a method of displaying a color image, the method comprising:

• receiving an image for projection, wherein the image is a color image comprising a first color component and a second color component, and
• calculating a first hologram of the first color component and a second hologram of the second color component;
• wherein the method further comprises:
• adding content of the second color component to the first color component before calculating the first hologram such that the first hologram contains information of the first color component and information of at least a portion of the second color component;
• reducing content of the second color component in correspondence with the content of the second color component added to the first color component;
• and
• forming a first holographic reconstruction by illuminating the first hologram with first color light and forming a second holographic reconstruction by illuminating the second hologram with second color light, wherein the first holographic reconstruction and second holographic reconstruction are formed at substantially the same time such that the first holographic reconstruction changes a chromaticity of the at least a portion of the second color component so as to reduce an amount of light of the second color in the first and second holographic reconstructions.

A projection system configured to:

• receive an image for projection, wherein the image is a color image comprising a first color component and a second color component;
• calculate a first hologram of the first color component and a second hologram of the second color component, and
• form a first holographic reconstruction by illuminating the first hologram with first color light and form a second holographic reconstruction by illuminating the second hologram with second color light, wherein the first holographic reconstruction and second holographic reconstruction are formed at substantially the same time;
• wherein the projection system is further configured to add content of the second color component to the first color component before calculating the first hologram such that the first hologram contains information of the first color component and information of at least a portion of the second color component such that the first holographic reconstruction changes a chromaticity of the at least a portion of the second color component and is further configured to reduce content of the second color component in correspondence with the content of the second color component added to the first color component;
• and
• wherein the first hologram is illuminated with first color light from a laser light source and the second hologram is illuminated with second color light from an LED or reduced/short wavelength (e.g. less than 440 nm) light source so as to reduce an amount of the second color in a composite color holographic reconstruction comprising the first holographic reconstruction and the second holographic reconstruction, optionally wherein the first color component is green and the second color component is blue.