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Color Vision

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Related Experiment Video

Updated: Jun 21, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

Published on: January 14, 2020

Practical method for color computer-generated rainbow holograms of real-existing objects.

Yile Shi¹, Hui Wang, Yong Li

¹Institute of Information and Optics, Zhejiang Normal University, Jin Hua 321004, China.

|July 23, 2009

Summary

A new method for creating full-color computer-generated rainbow holograms (CGRHs) of real objects has been developed. This innovative approach utilizes a novel algorithm and system, demonstrating feasibility for practical holographic applications.

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Last Updated: Jun 21, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display

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Published on: January 14, 2020

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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Area of Science:

Optics and Photonics
Computer Graphics
Holography

Background:

Traditional holography often struggles with full-color reproduction and real-object fabrication.
Computer-generated holography (CGH) offers a digital approach but faces challenges in complexity and color accuracy.

Purpose of the Study:

To introduce a novel method for generating full-color computer-generated rainbow holograms (CGRHs) of real-world objects.
To present a new algorithm and system for fabricating these advanced holographic displays.

Main Methods:

Development of a new algorithm linking CGRH coding with hologram reconstruction.
Integration of the algorithm with a computer-generated hologram system for color hologram generation.
Outputting the final hologram using an auto-microfilming system.

Main Results:

Successful generation of a full-color rainbow hologram for a real-existing object.
Experimental validation of the proposed algorithm and fabrication system.
Demonstration of the method's feasibility through presented results.

Conclusions:

The novel method provides a feasible approach for creating full-color CGRHs of real objects.
The developed algorithm and system advance the capabilities of holographic display technology.
This work opens possibilities for more realistic and vibrant holographic reconstructions.