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Additive/Subtractive Colour Theory

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Tiffany Powell

on 18 December 2012

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Transcript of Additive/Subtractive Colour Theory

Completed By:
Tiffany Powell
Jenna Wanner
Lindsay Dickie Additive and Subtractive Color Theory Exam Question 2. Applications of Subtractive Exam Question 3. Subtractive Color Theory Additive Color Theory Exam Question 1. Applications of Additive List 2 examples for how each are used in everyday life.
a. Additive color theory
b. subtractive color theory Subtractive color theory applies to paints, inks, dyes, and all natural colorants, like the colors in fruits and vegetables. Take a yellow pepper for example. In simple terms, certain chemicals in the skin of the pepper are absorbing every color in the spectrum except for yellow, which it is reflecting. How is it possible for us to view different colors on the spectrum? How are objects seen? Additive color is the creation of color by mixing colors of light. The three primary colors in light are red, blue, and green because they correspond to the red, green, and blue cones in the eye.

Vision relies on light sensitive cells in the retina of the eye. There are two kinds of sensors called rods and cones. Rods can work at very low intensity, but cannot produce sharp images or color. Cones can produce sharp images and color, but require more light to work. The combined information from the rods and cones is sent to the brain and allows us to see.
Subtractive color theory is the second method of mixing color. This method mixes pigment colors, like paint, and is what is used in the world of art and design. The three primary colors when using subtractive color theory in the art and design world are yellow, blue, and red. However, modern day printing press primaries are yellow, cyan, and magenta, which are the colors that are used in science’s eye. These colors go onto create secondary colors when mixed, which then go on to create tertiary colors, and so on. What are the primary colors of:
a. Light
b. Pigments Color television sets and computer monitors are two examples of displays that produce all the colors noticeable to the human eye through additive colors. Varying the intensities of the primary colors produces all the shades in between. What is:
a. Additive color theory
b. Subtractive color theory Some answers may include:
a. Computer monitors, color television, drama productions on stages (any screen that emits light)
b. Paint, ink/dyes used in printing Bonus Question: Answers are:
a. Red, Green, and Blue
b. In art and design: Red, Yellow, and Blue
In printing presses: Yellow, Cyan, and Magenta Introduction: Photographically, we are able to view objects through two methods of creating colors. These two methods are additive and subtractive color theory. Because substance color and colored light are different in the selective absorption of light, the difference in wavelengths of light and substance color all have an impact on the color they emit. Additive color theory is when light is used to create alternate colors in the spectrum, and subtractive color theory uses natural colorants to view the same colors on the spectrum. A primary color cannot be made from a combination of any other colors, whereas secondary colors are created from a combination of two primary colors, and tertiary color is a combination of three colors either primary or secondary.There is no use of mirrors or lenses in either of these two theories. The purpose of this project is to inform you how we are able to view objects with their color and comparing how we view colored light and pigment colors. Answer:
When you are looking at an object, the object is absorbing every color in the spectrum and reflecting back the color you are seeing. Answer:
a. Additive color is the creation of color by mixing colors of light.
b. Subtractive color is the creation of color by mixing colored pigments. There are three types of cones: red, green, and blue. Red are sensitive to red light, green are sensitive to green light, and blue are sensitive to blue light. The perception of color depends on how stimulated the cell types are. Additive color processes work by having the ability to generate an image composed of red, green, and blue light. The intensity for the three colors is preserved, so the image color is also preserved. The distribution of the colors of the spectrum in the image will most likely be wrong, but if the intensity for the primary colors is correct, the image will seem to be the right color. Additive Color Theory Continued Subtractive Color Theory Continued The subtractive color process works by blocking out certain colors in the array of colors that reach the eye. When light falls upon an object, some of the light is absorbed and turned into heat, while the rest of the light is reflected, creating the colors that we see every day. For example, a leaf is green because the chlorophyll in it reflects green, and absorbs the rest of the colors in the spectrum. All real world objects subtract some of the light that falls upon them, using the color that is left to reflect a certain color.
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