Podcast
Questions and Answers
What three colors are used to define the RGB color model?
What three colors are used to define the RGB color model?
- Red, Green, Blue (correct)
- Cyan, Magenta, Yellow
- Red, Yellow, Blue
- Red, Green, Yellow
What does the chromaticity diagram represent in the CIE space?
What does the chromaticity diagram represent in the CIE space?
- The range of visible colors
- The primary colors needed for printing
- The negative weights of color wavelengths
- The total energy of colors of light (correct)
What is the primary limitation of a typical monitor's gamut?
What is the primary limitation of a typical monitor's gamut?
- It shows all colors available in the CIE space
- It uses a limited chromaticity diagram
- It can only display negative weights of red
- It does not cover the entire CIE space (correct)
In the RGB color model, what color is produced by mixing Red and Blue?
In the RGB color model, what color is produced by mixing Red and Blue?
Which of the following color models is NOT part of the color model families mentioned?
Which of the following color models is NOT part of the color model families mentioned?
Which color models are primarily designed to be more convenient and intuitive for artists?
Which color models are primarily designed to be more convenient and intuitive for artists?
Which color model closely relates to the characteristics of display hardware?
Which color model closely relates to the characteristics of display hardware?
What characteristic do the YIQ and YUV color models share?
What characteristic do the YIQ and YUV color models share?
Which color model is identified as being more suitable for software developers?
Which color model is identified as being more suitable for software developers?
In terms of color representation, what aspect does the YIQ model focus on?
In terms of color representation, what aspect does the YIQ model focus on?
What does dynamic range refer to in the context of intensity in images?
What does dynamic range refer to in the context of intensity in images?
What can happen if the intensity value exceeds the maximum recorded intensity?
What can happen if the intensity value exceeds the maximum recorded intensity?
Which sequence is used to sample the intensity range in a geometric manner?
Which sequence is used to sample the intensity range in a geometric manner?
What is a common representation of the color red in the RGB color model?
What is a common representation of the color red in the RGB color model?
What does the term intensity refer to in the context of visible light?
What does the term intensity refer to in the context of visible light?
Which statement is true regarding the capture of intensity variations?
Which statement is true regarding the capture of intensity variations?
In relation to intensity, what does 'quantization' refer to?
In relation to intensity, what does 'quantization' refer to?
What is the approximate luminous intensity of a candle?
What is the approximate luminous intensity of a candle?
What is a primary characteristic of Adobe RGB compared to sRGB?
What is a primary characteristic of Adobe RGB compared to sRGB?
Which colors absorb green wavelengths in the CMY color model?
Which colors absorb green wavelengths in the CMY color model?
In the conversion from RGB to CMY, what formula is used for Cyan?
In the conversion from RGB to CMY, what formula is used for Cyan?
What does the letter 'K' represent in the CMYK color model?
What does the letter 'K' represent in the CMYK color model?
In the HSV color model, what does 'Value' refer to?
In the HSV color model, what does 'Value' refer to?
How do you calculate the Lightness (L) in the HSL model?
How do you calculate the Lightness (L) in the HSL model?
Which of the following is true about the YUV color model?
Which of the following is true about the YUV color model?
What is the main purpose of the YIQ color model?
What is the main purpose of the YIQ color model?
What is the formula used to convert RGB to Y for the YUV model?
What is the formula used to convert RGB to Y for the YUV model?
When converting RGB to HSL, if Max and Min are equal, what is S?
When converting RGB to HSL, if Max and Min are equal, what is S?
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Study Notes
Intensity
- Intensity is also known as luminosity, brightness, or luminance.
- The range of intensity is vast, from very dark to very bright.
- The ratio of maximum intensity to minimum intensity present in an image is called the dynamic range.
Color
- CIE (Commission Internationale de l’Éclairage) has defined 3 standard primaries: X, Y, & Z.
- CIE defined a chromaticity diagram as a plane in the space defined by X, Y, & Z primaries.
- Specific display devices have a maximum range of colors they can reproduce, known as gamut.
- The color model families are: RGB, CMY & CMYK, HSV & HSL, YUV & YIQ.
RGB Model
- It is an additive color model.
- Red + Blue = Magenta, Blue + Green = Cyan, Green + Red = Yellow, Red + Blue + Green = White
- Used by light-emitting displays such as monitors and projectors
- sRGB (standard RGB) is a color space created by HP & Microsoft
- Adobe RGB was developed by Adobe and has a larger gamut than sRGB.
CMY Model
- It is a subtractive color mode, based on pigment reflectance.
- Cyan (C) absorbs red, Magenta (M) absorbs green, Yellow (Y) absorbs blue.
- Used by color printers and reflective media systems.
CMYK Model
- Black (K) ink is added to CMY to improve quality and reduce ink usage.
- The K is determined by the minimum value of C, M, and Y.
HSV Model
- It is a user-oriented model that defines color with: Hue, Saturation, and Value.
- Value is similar to luminance.
- HSL model is similar to HSV.
- HSL model uses Lightness instead of Value, a range from grayscale to the chosen hue.
YUV Model
- A human visual system based color model, which uses a luminance channel (Y) and two chrominance channels.
- Used in PAL analog video and digital video.
- Human eyes are more sensitive to luminance than chrominance.
YIQ Model
- An NTSC (National Television System Committee) based model developed in North America.
- It aligns with human color perception and sensitivity.
- Y is the brightness, I is the orange-blue axis, and Q is the purple-green axis.
- Humans are primarily sensitive to Y, then to I, then to Q.
Color Model Summary
- Various color models have different purposes. Some are better suited for specific tasks, such as display devices or user-friendliness.
- Other models are more efficient for data processing and storage.
- RGB, YUV, and YIQ are closely related to the display hardware and human visual system.
- HSV, HSB, and HSL are user-friendly color models with perceptual properties.
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