Tutorials – Color Perception

Color can only exist when three components are present: a viewer, an object, and light. Although pure white light is perceived as colorless, it actually contains all colors in the visible spectrum. When white light hits an object, it selectively blocks some colors and reflects others; only the reflected colors contribute to the viewer's perception of color. The human eye senses this spectrum using a combination of rod and cone cells for vision. Rod cells are better for low-light vision, but can only sense the intensity of light, whereas while cone cells can also discern color, they function best in bright light. Three types of cone cells exist in your eye, with each being more sensitive to either short (S), medium (M), or long (L) wavelength light. Raw data courtesy of the Colour and Vision Research Laboratories (CVRL), UCL. Note how each type of cell does not just sense one color, but instead has varying degrees of sensitivity across a broad range of wavelengths. Additive Subtractive

NeoLucida - A Portable Camera Lucida for the 21st Century by Pablo Garcia & Golan Levin Long before Google Glass ... there was the Camera Lucida. The what? The camera lucida. We have designed the NeoLucida: the first portable camera lucida to be manufactured in nearly a century — and the lowest-cost commercial camera lucida ever designed. What is this "NeoLucida"? Beginning in the early 17th century, artists routinely used optical aids to help them create realistic drawings. In short, a camera lucida allows you to trace what you see. By the mid-1800s, camera lucidas were everywhere. (If you'd like to learn more about how the Old Masters likely used optical technologies to create their work, check out David Hockney's book Secret Knowledge, or this terrific BBC documentary (at YouTube) about his research.) Now try this experiment. It hasn't helped that portable camera lucidas have become so rare and costly that most students will never have the chance to try one—not even in an art school. So, why are you doing this? Wait: aren't there modern, competing products?

Warping Fisheye Images for Spherical Mirror Projection Warping Fisheye Images for Spherical Mirror Projection… Or… How to make your front room into an immersive cinema. This post doesn’t go into any of the complex mathematics involved with spherical mirror projection. For that information I recommend using the invaluable resources at . This post explains a practical solution for projecting onto complex geometry using spherical mirrors, 3ds Max and 123D Catch. Okay, so really I’m just trying to figure out a good way of previewing my fulldome work at home, thus speeding up the creative process. This is a video showing the physical setup and some immersive video. Real-World Setup The main elements to consider are these: RoomProjectorSpherical MirrorComputer/Robotic Thinking MachineViewing Position Room The area I’m projecting onto is mainly white walls, which are appropriate for the brightness of projector I have. Projector Spherical Mirror Computer The laptop is a thousand year old Macbook Pro running Leopard. Viewing Position