The spectrum of color involves four colors: red, orange, yellow, green, blue, indigo, and violet. A true red has equal levels of yellow and magenta. A true blue will have cyan as its most dense base, followed by magenta, and then yellow; however, a true yellow is exactly the opposite. We expect that a gray, which includes white, will have an equal amount of cyan, magenta, and yellow in it. .
The history of photography is quite an interesting subject. Recently, High-speed photography has made many aspects of motion never before seen; even the planets can now be observed in new ways. The predecessor of the modern camera was known as the camera obscura, which was, in essence, a dark room with a hole in the wall that projected images onto a screen where they could be traced. In 1727, Johann Heinrich Schulze proved that silver salts were darkened by lights, which led to the production of the daguerreotype. In 1837, Louis Daugerre created the daguerreotype, however, it still took over thirty minutes for a picture to transfer to film on a sunny day. By December of 1840, Goddard had created minuscule portraits about an inch in diameter. The most important advances in photographic lens and camera design came from Jozsef Petzval and Friedrich Voigtlãnder. These two men invented a "dry-plate process-, which used a technology called silver-gelatin emulsion or "gel plates- to catch pictures faster than ever, such as an Olympic sprinter in mid-stride or a horse galloping. The only downside to this was that a darkroom was needed in order to develop these prints. Eventually, a man named George Eastman invented a way to mass-produce gel plates and founded the company that would one day be Kodak. In 1888, he also invented a much smaller camera that made taking pictures very easy. He continued to introduce cameras and films until his retirement. Finally, he solved the darkroom dilemma by creating rolls of film that could be unloaded in daylight and brought photography to the masses.