Notes by Dr. Optoglass: The Human Eye – Part III

Topics Covered: How the Cones produce color The visible spectrum Defining Color Space The CIE XYZ 1931 color space It is the eye of other people that ruin us. If I were blind I would want, neither fine clothes, fine houses or fine furniture – Benjamin Franklin Humans normally have three kinds of cones. They […]

Notes by Dr. Optoglass: The Human Eye – Part II

Topics Covered: The Retina, Macula and the Fovea About Rods and Cones The eye of a human being is a microscope, which makes the world seem bigger than it really is – Khalil Gibran Light, after having passed through the vitreous body hits the Retina, which covers the inner lining of the eye. ‘Retina’ comes […]

Notes by Dr. Optoglass: The Human Eye – Part I

Topics Covered: A Diagram of the Human Eye for Videographers and Photographers The Pupil, Iris and the Lens The Vitreous Body Every closed eye is not sleeping, and every open eye is not seeing – Bill Cosby Start by knowing this: The human eye is more complex than any camera, and possibly more complex than […]

What Noise Does

Topics Covered: Noise Signal-to-Noise Ratio Noise proves nothing. Often a hen who has merely laid an egg cackles as if she laid an asteroid – Mark Twain “Noise is always unwanted,” declared Dr. Optoglass. “But sometimes it fools us into thinking its existence is warranted.” “I see you are not a believer in noise, Dr. […]

At the Edge of Acutance

Topics Covered: Acutance or Edge contrast Local contrast vs Global contrast People see only what they are prepared to see – Ralph Waldo Emerson “Yes, the eye can be cheated,” sighed Dr. Optoglass. “You’ll find visual tricks everywhere, so I don’t have to convince you of that. Sometimes the eye makes something look worse than […]

The World of Contrasts

Topics Covered: What is Contrast? Contrast Ratio and Dynamic Range Contrast is what makes photography interesting – Conrad Hall “You like boundaries and edges, don’t you?” quizzed Dr. Optoglass. He can see through me, thought Bob. “They are interesting, I guess.” “More than that, my dear boy. They are absolutely necessary. Did you wonder why […]