10 Questions
What is the primary difference between RGB and CMYK color models?
RGB is additive, while CMYK is subtractive
What is the purpose of black in the CMYK color model?
To absorb light and achieve the desired color
What does the 'H' in HSL stand for?
Hue
What is the range of saturation values in the HSL color model?
0-100
What is the purpose of the RGB color model?
To display colors on digital devices
What is the result of combining red, green, and blue in the RGB color model?
White
What is the difference between HSL and HSV color models?
HSL stands for Hue, Saturation, Lightness, while HSV stands for Hue, Saturation, Value
What is the purpose of the CMYK color model?
To print colors on paper
What is the range of hue values in the HSL color model?
0-360
What happens when you subtract cyan, magenta, and yellow in the CMYK color model?
You get the RGB colors
Study Notes
Complementary Colors
- Complementary colors are obtained by subtracting additive primary colors from white or by adding other two additive primaries.
- Cyan, magenta, and yellow are subtractive primary colors used in mixing ink/paint.
- Complementary color formulas: C = G+B = W-R, M = R+B = W-G, Y = R+G = W-B.
CMYK Color Model
- Real inks do not correspond to ideal subtractive primaries.
- Combining three inks for black is undesirable, so printers use four process colors: cyan, magenta, yellow, and black.
- CMYK gamut is not the same as RGB gamut.
- Combining actual ink of CMY does not produce a good black.
RGB vs CMYK
- RGB is an additive color model used for digital displays, while CMYK is a subtractive color model used for printing.
- Computer monitors have a larger color gamut than printing, which is why they can display more colors.
- Printing presses still work by laying down one color, waiting for it to dry, and then adding another color.
Color Palettes
- Ideally, choose 256 most important colors in an image to store in its palette.
- When a 24-bit image is reduced to indexed color, some colors may be missing from the palette.
- Missing colors can be replaced by the nearest color, which may lead to posterization.
Dithering
- Dithering replaces missing colors with a pattern of dots of several different colors, with the intention that optical mixing in the eye will produce the desired color.
RGB Color Space
- The RGB color space has three axes: red, green, and blue.
- Any valid RGB color falls within this color space.
CMYK Color Model
- Cyan, magenta, and yellow are the primary colors used in color printing.
- Cyan is the complement of red, magenta is the complement of green, and yellow is the complement of blue.
- Combinations of different amounts of the three primary colors can produce a wide range of colors with good saturation.
HSL Color Model
- HSL stands for Hue, Saturation, and Lightness.
- HSL color values are specified with: hsl(hue, saturation, lightness).
- Hue is a degree on the color wheel from 0 to 360, saturation is a percentage value from 0% to 100%, and lightness is a value from 0% to 100%.
This quiz covers the concepts of complementary colors, subtractive primary colors, and the CMYK color model used in printing. It explains how to find complementary colors and how the CMYK model works.
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