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Amount Of Green Light:
The primary purpose of a color Filter in landscape photography is to correct this state of affairs, and it is accomplished by using a Filter which reduces the amount of ultraviolet, violet, and blue light without reducing the amount of green light. The result is a picture in which the tone values are almost the same as seen in the original subject. Similar correction can be obtained in pictures of flowers of different colors, as illustrated on the opposite page.Because Clerk Maxwell added red, green, and blue light together, this technique is called additive. An equal addition of the three colors forms white; red and green add to form yellow; red and blue, magenta; green and blue, the blue-green known by photographers as cyan. It is important to bear in mind that this theory holds true only for colored light; the mixture of pigments is another matter.
Lamp bases and shades. The actual size and shape of a standing Floor or Table light has little to do with the amount of light that may come from the fixture. Design alone should be the main influence in the size, shape, and material of the base and shade. The wattage of the bulb alone affects the amount of light produced, but the amount of illumination, in spite of strong wattage, will be modulated by the shade itself and by the Wall color. A small lamp with a strong bulb may give far greater illumination than a large fixture with a weak bulb. The position of the bulbs or tubes within the shade also will affect the amount of illumination. The spread of the illumination from any shaded source of light is limited by the angles that the source makes with the upper and lower rims of the shade. Bulbs when placed near the top of a shade, throw rays at a wide angle upward and a narrow angle downward, and vice versa.
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