Additive Colors SE

Name: Date: Student Exploration: Additive Colors Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: additive color, cyan, magenta, primary colors, RGB value, secondary color, visible spectrum Prior Knowledge Questions (Do these BEFORE using the Gizmo.) When white light passes through a prism, it splits into a rainbow of colors. These colors make up the visible spectrum shown below. 1.​ What is the order of colors in the visible spectrum? The colors in the visible light spectrum is red, orange, yellow, green, blue, indigo, violet. 2.​ What do you think would happen if all of the colors of light in the visible spectrum were blended together? It would turn brown. Gizmo Warm-up On a computer or TV screen, all the colors you see are mixtures of only three primary colors of light. In the Additive Colors Gizmo, you will explore how the primary colors can be mixed to make any color. 1.​ The primary colors are listed on the left side of the Gizmo. What are they? The primary colors are red, green, and blue. 2.​ Check each box to turn each color on. Notice that the intensity of each color can be adjusted with the slider. What happens to the color if you move the slider to the left? When I move the slider to the left the color gets lighter and dimmer. 3.​ Turn on Show RGB values at the mouse location, and move each slider to the right. The RGB value gives how much red, green, and blue light is in a given color. Move the cursor over each colored circle. List the RGB values of each pure color below. Red: 2 5 5 Green: 2 5 5 Blue: 2 5 5 Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved Activity A: Get the Gizmo ready: ●​ Set the Red, Green, and Blue values to 255. Mixing light Question: What happens when red, blue, and green light are mixed? 1.​ Predict: What color do you expect to be produced from each of the following light combinations? Red and green light: yellow Green and blue light: teal Red and blue light: magenta Red, green, and blue light: white 2.​ Observe: Drag the red circle so that it overlaps with the green circle. What color is made by mixing red and green light? If you put the two circles on top of each other it turns yellow. 3.​ Gather data: Try the remaining color combinations. Describe the resulting colors below. Red and blue light: If you put the two circles on top of each other it turns magenta. Green and blue light: If you put the two circles on top of each other it turns teal. Red, green, and blue light: If you put the two circles on top of each other it turns white. 4.​ Identify: A secondary color is produced when two primary colors are mixed. The names of the secondary colors are yellow, cyan (blue-green), and magenta (pinkish purple). Without using the Gizmo, name the numbered colors in the diagram at right, and predict the RGB value of each. Area Color RGB value 1 yellow 255,255,0 2 magenta 255,0,255 3 teal 0,255,255 4 white 255,255,255 After completing the table, check your answers by using the Gizmo. 5.​ Analyze: Colored lights are called additive colors. Why do you think this is so? Additive lights are called additive colors because you need to add colors together to make the colors. Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved ​ Get the Gizmo ready: Activity B: Creating colors ●​ Move the red, green, and blue circles so they completely overlap. ●​ Check that the Red, Green, and Blue values are all set to 255. Question: How can any color be made from a combination of red, blue, and green light? 1.​ Predict: How do you think you could use the Gizmo to make the color gray? I would make all the colors dimmer and the middle would turn grey. 2.​ Observe: Change the Red, Green, and Blue values to 90. What color does this produce? When I put all the numbers at 90 it turns grey. 3.​ Create: Using the Gizmo, try to create a color that matches each description below. Write the RGB value of each color that you create. In the last row of the table, describe your own object or color and give its RGB value. Description RGB value A pale blue sky 90,145,235 A brown dog 90,60,0 A delicate pink rose 90, 60,0 An orange pumpkin 235, 90, 0 A royal purple robe 155, 0, 255 4.​ Calculate: Describe the RGB value and color you would obtain with each combination described below. Use the Gizmo to check your answers. RGB Value Color A.​ Yellow (255, 255, 0) and blue (0, 0, 255) 255,255,255 white B.​ Plum (120, 0, 120) and dark green (0, 120, 0) 120,120,120 grey C.​ Teal (0, 90, 90) and bronze (185, 150, 0) 185, 240, 90 pale yellow 5.​ Summarize: If you know the RGB values of two colors of light, how could you calculate the RGB value of a mixture of the two colors? Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved ​ I now know that the lower the number the darker the color, so if I add a darker color to a lighter color the lighter color you will be able to see more of. This is how I will be able to estimate colors with numbers. Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved