Chemicals are used in the developing process, which react in turn with the light-sensitive grains, darkening those exposed to light to produce a negative, which is then converted into a positive image in the printing process. In modern cameras, this is the job of the diaphragm, which works the same way as the pupil in the eye. Changing the size of the aperture or lens opening controls the amount of light. Too little light has the opposite effect: not enough grains react and the picture is too dark, as anyone who has ever taken an indoor photo without a flash can attest. If too much light is let in, too many grains will react and the picture will appear washed out. This induces the chemical reaction, forming a latent image of the visible light reflected off the objects in the viewfinder. By opening a camera’s shutter for a split second, you expose the crystals to light and transfer energy from the photons to the silver halide crystals. These crystals are naturally sensitive to light. The reflected light causes a chemical change to the film inside the camera, which is coated with grains of silver-halide crystals. Photography essentially freezes a moment in time by recording the visible light reflected from the objects in the camera lens’s field of view. With the invention of film, they were able to make those images permanent. Scientists already knew that silver chloride and silver nitrate both turned dark when exposed to light, and the first silhouette images were captured by Thomas Wedgwood at the start of the 19th century. It would take more than a century for chemistry to catch up with de la Roche’s imagination. He envisioned an imaginary world where it was possible to capture images from nature on a canvas coated with a sticky substance, which would preserve the image after it had been dried in the dark. The emergence of photography was eerily prefigured in a mid-18th century science fiction novel by Charles Francois Tiphaigne de la Roche called Giphantie. It's just the latest wrinkle in a technique that's been around for about 125 years, in which "exposures are made usually at night or in a darkened room by moving a handheld light source or by moving the camera." ( Thank you, Wikipedia!) Light painting has a fascinating history. Taking this one step further, Pixelstick can increment through a series of images over multiple exposures, opening up light painting to the world of timelapse, and allowing for animations the likes of which have never before seen. Pixelstick reads images created in Photoshop (or the image editor of your choice) and displays them one line at a time, creating endless possibilities for abstract and/or photorealistic art. The brainchild of Duncan Frazier and Steve McGuigan of Brookyln-based BitBanger Labs, the Pixelstick lets users create long-exposure light paintings - and yes, they have a Kickstarter campaign. Via This Colossal, Jen-Luc Piquant was thrilled to learn about a nifty new tool called the Pixelstick.
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