1. What are black, white, and gray? How are these produced in RGB, CMYK, and HSV
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Question
1. What are black, white, and gray? How are these produced in RGB, CMYK, and HSV?
2. How can different values be produced?
3.Explain how additive color mixing works in the RGB model with direct light.
4. Explain how subtractive mixing works in the CMYK model for print with reflected light.
5. Describe how computer monitors produce color. (Hint: additive mixing.)
6. Describe how a video projector produces color. (Hint: additive mixing, reflection off a white screen.)
7. Describe how print inks produce color. (Hint: subtractive mixing.)
1.How is hue expressed in different color models: RGB (red/green/blue), CMYK (cyan/magenta/yellow/black), Hue/Saturation/Value (HSV)?
8. The surface of the sun is 5800 K.
a) Use Wien’s Displacement Law to calculate the peak wavelength emitted
Use max = (2.899*10-3 mK)/T. Answer: 499.6 nm
b) What color is this? (Look up the wavelength on a spectrum.) light blue
9. Average human body temperature is 98.6 °F.
Use TK = (5/9)(TF – 32) + 273
a) Convert this to degrees Kelvin. 310 K
b) Calculate the peak wavelength emitted by a human. Use Wien’s Displacement Law. 9348 nm
c) In what portion of the electromagnetic spectrum is this wavelength? Would you be able to see this with your eyes? If not, how could you detect this radiation? infrared
10. For the following EM waves, either their wavelength or frequency is specified. You are to first calculate the missing quantity (frequency or wavelength) using the equation c = f, where the speed of light c = 3*108 m/s. Then look up the wave in the EM spectrum table and state which type of wave it is (radio, infrared, microwave, visible light, ultraviolet, x-ray, gamma ray). If the wave is visible light, state what color it is. Note that 1 nm = 10-9 m, 1 mm = 10-3 m, and 1 m = 10-6 m.
a) 450 nm f = 6.67*1014 Hz visible (blue/indigo)
b) 5.0*1014 Hz = 6.00*10-7 m = 600 nm (yellow/orange)
c) 4.7 m
d) 3.3*1019 Hz
e) 2 mm
f) 2.5 m
g) 6.1*1015 Hz
Explanation / Answer
We know that CMYK and RGB are the methods of creating colors. They are the two color spaces
CMYK is subtractive, like paint/pigment. If we add more colors in a white paper it will turn into black. CMYK represents the standard colored inks that printers use to create colors. The colors they can produce are cyan, magenta, yellow and black.
RGB is additive. It uses the way that light creates colours. If we created black color and if we add more colors it becomes white. All colors begin with black and if we add different color to produce visible colors,RGB(red, green, blue).
Most screens (computer, phone, media player, television, ect) are RGB (e-ink screens being an exception), the pixels have little subpixels that just show red, green or blue.
HSV (also called HSB) is based on the RGB system – HSV can also defined as a transformation of the RGB color space. And since it is still additive, and is used for computer displays. The three components of this color system are:
H: Hue. It can be defined as the angle on the color wheel. Starting with red at 0 degrees.
S: Saturation. It can be defined the ammout of 'color' in the color. So if the saturation for an image is at 0%, then the image is greyscale.
V: Value (or B brightness). It can be defined as the brightness of the color, If this is at 0% then you have black, no matter what the hue and saturation values are. With V at 100%, every colour is at it's brightest.
We know that the computer creates colors based on the RGB model. RGB is additive. It uses the way that light creates colours. A spectrum of visible light is produced by RGB. Computers Monitors has the capability to create millions of colors by combining different percentages of three primaries, red, green, and blue . In RGB, mixing of red and green equally will produce yellow, mixing of green and blue creates cyan, and the mixing of red and blue creates magenta.So all 3 colors, red, green and blue are mixed equally they produce white light. Because of this mixing the RGB model is called the additive color model.
This is how and LCD projector work . It projects the light into a mirror and the mirror splits into three primary colours: red, green and blue.
The next step is that these colors then pass through three separate glass panels , which is why this technology is referred to as 3LCD. Once the light is projected through the LCD panels, individual pixels are opened or closed to allow light through or block it. So it can either open or close the light passing over it. The separate colours are then converged using another prism and projected on to the screen.
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