Color Questions Explanation Full Flashcards
(20 cards)
In the RGB color model, what type of color mixing is used?
Additive mixing
RGB uses light to form colors by adding wavelengths. More light = closer to white.
Which component of HSV color space corresponds to the perceived color type (e.g., red, green, blue)?
Hue
Hue refers to the type of color we see (like red, blue, green).
Which color model is primarily used in analog NTSC television broadcasting?
YIQ
YIQ separates brightness and color info; used in old NTSC TV systems.
Which part of human eye is responsible for color perception?
Cones
Cones in the retina detect color; rods handle night vision.
In CMY printing, what color results when C=M=Y=0?
White
In CMY, 0 ink = blank white paper (no color subtracted).
What is the main reason for introducing a separate black (K) component in CMYK color model?
To reduce ink usage and improve black stability
Adding black (K) ink reduces the need to mix full CMY, which saves ink and gives cleaner blacks.
What is the neutral point (E) in the CIE chromaticity diagram?
x=y=1/3
In the CIE chromaticity diagram, this is the ‘neutral white’ point.
Which of the following is a perceptually more uniform color space compared to CIE XYZ?
CIE Lab*
CIE Lab is designed to match human perception more uniformly than RGB or XYZ.
Which standard RGB specification is used in JPEG, PNG, and HTML?
sRGB
Standard RGB used on most displays, websites, and images.
In YUV color space, Y component represents:
Luminance
Y in YUV represents brightness (not color).
Which factors complicate color perception?
A. Spectral composition of light
B. Different spectral albedos
C. Printer type
D. Color constancy
Spectral composition of light; Different spectral albedos; Color constancy
Color perception varies with lighting, material reflection, and how our brain adjusts for consistency.
Which properties are true about RGB color space?
A. It is device-dependent
B. It uses additive mixing
C. It is perceptually uniform
D. It is hard to perceive color differences based on distance in RGB space
It is device-dependent; It uses additive mixing; It is hard to perceive color differences based on distance in RGB space
RGB is not perceptually uniform, and colors can be hard to differentiate based on distance.
Which of the following are chromatic components in video color spaces like YUV and YCbCr?
A. U
B. V
C. Y
D. Cb and Cr
U; V; Cb and Cr
U and V (or Cb and Cr) represent chromatic components in color difference models.
Which transformations between color spaces are linear?
A. RGB to XYZ
B. RGB to HSV
C. RGB to YUV
D. XYZ to CIE x,y
RGB to XYZ; RGB to YUV
Linear transformations preserve matrix properties; HSV involves nonlinear conversions.
Important features of HSV and HLS color spaces include:
A. Hue representing color type
B. Separation of luminance and color information
C. Use of additive mixing
D. Cylindrical or double-pyramid geometric representation
Hue representing color type; Separation of luminance and color information; Cylindrical or double-pyramid geometric representation
These models separate color from brightness and are structured geometrically.
Advantages of Under Color Removal (UCR) in CMYK printing are:
A. Reduces ink usage
B. Sharper black details
C. Increases color vibrancy
D. Reduces smudging
Reduces ink usage; Sharper black details; Reduces smudging
UCR improves print clarity while saving ink.
In sRGB standard:
A. R, G, B color primaries are precisely defined
B. Gamma correction is applied
C. It is used mainly in print applications
D. The white point is precisely defined
R, G, B color primaries are precisely defined; Gamma correction is applied; The white point is precisely defined
sRGB is a display-focused color space with defined gamma and white point.
In the CIE XYZ model:
A. X, Y, Z are real primary colors
B. Y corresponds to luminance
C. It is linear with human perception
D. It is device-independent
Y corresponds to luminance; It is device-independent
CIE XYZ abstracts color; Y indicates luminance, and it’s device-independent.
Which color spaces are considered device-independent?
A. sRGB
B. CIE XYZ
C. CIE Lab*
D. HSV
CIE XYZ; CIE Lab*
These are mathematical spaces not tied to hardware.
When converting from RGB to grayscale (luminance), we:
A. Weight red and green more than blue
B. Only keep the red channel
C. Drop hue and saturation information
D. Use a linear combination of R, G, B
Weight red and green more than blue; Drop hue and saturation information; Use a linear combination of R, G, B
Grayscale conversion averages color weights based on luminance perception.
