Interactive Computer Graphics

Interactive Computer Graphics - JMU Bachelor Informatik

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Flashcards	272
Language	English
Category	Computer Science
Level	University
Created / Updated	27.07.2022 / 31.07.2022
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What is the spectrum range of human visible light?

200 - 500nm

370 - 770mm

380 - 780nm

What is photopic vision?

vision of the eye under well-lit conditions

perception of colors outside the human visible light spectrum

synonym of the dynamic range of a camera sensor

Which pure color has the shortest wavelength?

Red

Violet

Green

Blue

Orange

Brightness depends on the light’s ... .

amplitude

frequency

wavelength

The cones (Zapfen) in our eyes are important to ... .

perceive colors

see in low light condition

have a wide field of view

The rods (Stäbchen) in our eyes are important to ... .

perceive colors

see in low light condition

have a wide field of view

Which types of cells are most probably malfunctioning if one has Red-Green Blindness?

rods

cones

ganglions

In which order is light passing through the layers of the retina when entering the eye?

(1) rods and cones then (2) bipolar and horizontal cells then (3) ganglions

(1) ganglions then (2) bipolar and horizontal cells then (3) Rods and cones

(1) bipolar and horizontal cells then (2) ganglions then (3) Rods and cones

What are correct design guidelines derived from knowledge of visual perception?

Do not use red or green on edges of large pictures or ads.

Do not use pure red colored text (or fine lines and shapes).

Do not use pure blue colored text (or fine lines and shapes).

Color is very useful as sole distinction.

Do not use pure green colored text (or fine lines and shapes).

What are correct properties of human vision?

The eyes are able to transform electromagnetic radiation in the spectrum between 380–780nm into neural signals.

Amplitude and frequency of the visual spectrum is not important for vision.

Color is determined by the amplitude of the spectrum.

What does the Tristimulus Theory postulate?

There are three ways for humans to perceive their surroundings (hearing, smelling, seeing).

Humans can only perceive a third of all colors.

Any color can be described by three components.

What are color models like RGB or CMYK good for?

They allow us to quantify colors.

They eliminate the need to label colors (like “coral red”).

They are unnecessary since we can apply the Tristimulus Theory.

What does the perimeter of the CIE 1931 color space represents?

colors of maximum saturation

primary colors

physical stimuli magnitudes to individual light frequencies

What information is missing from a CIE diagram for human eye perception?

nothing at all

some colors like brown or black

colors outside the perimeter

When was the CIE Color System developed?

1923

1931

1945

1956

How large is the area of foveal sight?

1°

2°

5°

10°

25°

What does CIE abbreviate?

Color International Explanation

Commandante Internationale Equestri

Commision Internationale d l’Eclairage

Which wavelengths were for the light sources in the CIE experiment?

Red: 700nm; Green: 546nm; Blue: 436nm

Red: 700nm; Green: 516nm; Blue: 352nm

Red: 720nm; Green: 516nm; Blue: 436nm

Red: 720nm; Green: 546nm; Blue: 352nm

Red: 720nm; Green: 516nm; Blue: 352nm

How did the experiment leading to the CIE color system produce negative red values?

They add a red light to the reference color.

They use red light absorbing filters.

They compensate with increased blue and green intensities.

Which statements of the CIE XYZ representation are correct?

The light sources represented by X, Y, Z are not monochromatic.

The Y axis represents perceived radiance.

Color values are exclusively on the X + Y + Z = 1 plane.

The white point in the CIE chromaticity diagram …

is located on the black body curve.

describes the point of maximal color saturation.

depends on the type of illumination.

The purple line ...

connects the spectrum’s ends.

describes the intersection of the x axis with the sRGB color gamut.

is the horizontal line in the chromaticity diagram at the blue point.

What does RGB stand for?

Red Green Blue

Red Green Brightness

Red Grominance Brighness

What color mixing model is employed by the RGB model?

subtractive

additive

definitive

What is the resulting color of adding red and green light?

magenta

cyan

yellow

Which devices use the RGB color model?

printers

projectors

television sets

Why are the color values in the range of [0; 1]?

Light only occurs in quantities between 0 and 1.

Values are normalised to abstract for device specificities.

The hardware voltages to create color are between 0 and 1.

How does the color model described by the RGB model look?

cube

cone

double cone

What color is described by CMY (1, 1, 1)?

black

white

red

yellow

orange

A painter paints an image with acrylic paints. What color mixing model do the colors adhere to?

additive

subtractive

divisive

CMY color model: how does the final color change if you increase the intensity of one color-component?

It gets darker.

It gets lighter.

It gets more transparent.

It gets less transparent.

Which devices use the CMY color model?

printers

projectors

computer screens

Two devices interpret the same color definition following the same color model. Can we expect the final colors to be equal?

The same description leads to the same color on all devices.

Devices may produce colors that differ from one another.

Devices may produce a color that another device is not even able to produce.

How does the CMY color model relate to the RGB color model?

oppositional

complementary

additive

Why is the CMYK color model often used in favour of the CMY color model?

Printers may not be able to properly mix cyan magenta and yellow to produce black and instead use black ink directly.

The CMY color representation is more prone to rounding errors than the CMYK representation.

The CMYK color model can describe a wider gamut than the CMY color model.

To save Ink.

Why was the YUV color model developed?

To be more intuitive for artists drawing a digital painting.

To describe the whole human perceivable colors.

To describe color information for early TV sets.

How does the color model described by the HSV model look?

cube

cone

double cone

How does the color model described by the HSL model look?

cube

cone

double cone

What aspect does the H dimension of the HSV color model control?

The color’s tone.

The saturation.

The brightness.

The perception intensity.

What advantages has the HSV color model?

It is more intuitive.

It can be displayed on more devices than the RGB color model.

It carries more color information than the CMY color model.

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