Y 0.299R + 0.587G + 0.114Bf/2.8 · 1:1 macro

Sunray Image — Issue 2026

The science of sight, explained plainly.

Clear guides to digital images, video formats and the craft of photography — from pixel layouts to midday light.

Three pillars

Tools · Formats · Practice

How viewers, analyzers and comparison utilities work, and how to choose the right one for a job.

Pixel formats, color spaces, containers and the math behind converting one to another cleanly.

Field-tested guidance on light, exposure and composition, written for people who actually shoot.

Midday sun has a bad reputation. Used deliberately, its hard edges and deep shadows can become the strongest part of a photograph.

Two files can hold exactly the same picture and still be unreadable to each other. The difference is how the Y, U and V samples are ordered.

Raw video files have no header and no instructions. A viewer's real job is to guess well — or to ask you the right questions.

Those three numbers describe how much colour detail a video keeps. Here is what they mean and when the difference is visible.

The histogram is not a grade on your photo. It is a quick map of where your tones sit — and that is all you need it to be.

Objective quality metrics are useful, fast and repeatable. They are also easy to misread. Here is how to use them alongside visual inspection.

Reference · Legacy archive

A plain-language guide to headerless YUV files and the viewing, conversion, editing and analysis tasks that YUVTools was known for.