Color Science on ScubAI knowledge base

Light and Color Primer

Mon, 01 Jan 0001 00:00:00 +0000

Light and Color: A Primer for Photographers#

How light works, how we see it, how cameras capture it, and how we reproduce it. Understanding these fundamentals is essential for making informed decisions about color — whether on land or underwater.

1. Light is a spectrum#

Light is electromagnetic radiation — the same physical phenomenon as radio waves, microwaves, X-rays, and gamma rays, differing only in wavelength. What we call “visible light” is the narrow band of wavelengths that the human eye can detect, roughly 380nm (violet) to 700nm (red). Below this range sits ultraviolet; above it, infrared. The full electromagnetic spectrum spans many orders of magnitude, but everything we see — every color, every image — comes from this sliver.

The Digital Imaging Chain

Mon, 01 Jan 0001 00:00:00 +0000

The Digital Imaging Chain#

A photograph is not a window onto a scene. It’s the end product of a chain of transformations — from light source to surface to sensor to screen to eye to brain. Each stage reshapes the signal. Each is a place where information can be lost or distorted. Understanding this chain is what separates deliberate color decisions from guesswork.

The chain of transformations from light source to perceived color. Every stage shapes the final result.

What Water Does to Light

Mon, 01 Jan 0001 00:00:00 +0000

What Water Does to Light#

The Light and Color Primer covered how light carries color, how we perceive it, and how cameras record it. All of that assumed light traveling through air — a medium so transparent we can ignore it. Water is different. It absorbs, scatters, and reshapes light in ways that make underwater photography a fundamentally harder problem than surface photography.

This article describes those problems. Solutions come later.

Restoring Color Underwater

Mon, 01 Jan 0001 00:00:00 +0000

Restoring Color Underwater#

The previous article described what water does to light — absorption strips color, scattering strips contrast, and every body of water does it differently. The damage is physical and happens before the camera is even involved.

So what can be done?

Underwater photographers have developed a toolkit of techniques — some at capture time, some after the dive. Each one addresses a piece of the problem. None of them addresses all of it.