คำศัพท์ทางเคมีThese filters are generally constructed of dyed glass, lacquered gelatin, or synthetic polymers (plastics) and have a wide range of applications. They are frequently used to create special effects in a number of photography applications and are widely employed in the cinema industry. In addition, absorption filters are commonly found in signs and traffic signals, as well as directional signals on vehicles such as automobiles, boats, and airplanes.
A typical absorption filter is illustrated above in Figure 1. In this example, a magenta filter that is designed to adapt to a camera lens is met by three incident light waves. Though they are illustrated as red, green, and blue waves, they are intended to represent all of the colors that comprise white light. Notice the filter selectively transmits the red and blue portions of the incident white light spectrum, but absorbs most of the green wavelengths. Remember, as discussed in the primary colors article, the color magenta is obtained by subtracting green from white light.
In Figure 2, the light-modulating properties of another typical color filter are illustrated. In this case, a color correction filter that adds a factor of 50 color compensating (cc) units to incident light, a concept that will be discussed in more detail below, is being examined. The percentage of filter absorption is plotted against the visible wavelengths that are passed through the filter. The peak intensity of absorbed light falls at about 550 nanometers, right in the center of the green region of visible wavelengths. However, the plot also shows that some light in the blue and red regions is absorbed, indicating that this filter is not perfect and that a small portion of all wavelengths are hindered by it. Common to most filters, this type of unwanted absorption is often termed secondary absorption. If this filter were perfect, the plot in Figure 2 would have a very sharp peak centered in the green region that trailed off to zero absorption at non-green wavelengths. Yet, this is a nearly impossible feat to accomplish in the real world where visible absorption filters need to be manufactured at reasonable prices.
คำศัพท์ทางเคมีThese filters are generally constructed of dyed glass, lacquered gelatin, or synthetic polymers (plastics) and have a wide range of applications. They are frequently used to create special effects in a number of photography applications and are widely employed in the cinema industry. In addition, absorption filters are commonly found in signs and traffic signals, as well as directional signals on vehicles such as automobiles, boats, and airplanes.A typical absorption filter is illustrated above in Figure 1. In this example, a magenta filter that is designed to adapt to a camera lens is met by three incident light waves. Though they are illustrated as red, green, and blue waves, they are intended to represent all of the colors that comprise white light. Notice the filter selectively transmits the red and blue portions of the incident white light spectrum, but absorbs most of the green wavelengths. Remember, as discussed in the primary colors article, the color magenta is obtained by subtracting green from white light.In Figure 2, the light-modulating properties of another typical color filter are illustrated. In this case, a color correction filter that adds a factor of 50 color compensating (cc) units to incident light, a concept that will be discussed in more detail below, is being examined. The percentage of filter absorption is plotted against the visible wavelengths that are passed through the filter. The peak intensity of absorbed light falls at about 550 nanometers, right in the center of the green region of visible wavelengths. However, the plot also shows that some light in the blue and red regions is absorbed, indicating that this filter is not perfect and that a small portion of all wavelengths are hindered by it. Common to most filters, this type of unwanted absorption is often termed secondary absorption. If this filter were perfect, the plot in Figure 2 would have a very sharp peak centered in the green region that trailed off to zero absorption at non-green wavelengths. Yet, this is a nearly impossible feat to accomplish in the real world where visible absorption filters need to be manufactured at reasonable prices.
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