Deck 7: Simple Graphics and Image Processing

Question 1

An N-level c-curve can be drawn with a recursive function.

Answer 1

True

Question 2

Early recording and playback devices for images and sound were all discrete devices.

Answer 2

False

Question 3

The coordinate system for turtle graphics is the standard Cartesian system, with the origin (0, 0) at the bottom-left corner of a window.

Answer 3

False

Question 4

The RGB system is called a true color system.

Question 5

In the RGB system, each color component can range from 0 through 127.

Question 6

The rectangular display area on a computer screen is made up of colored dots called picture elements or pixels.

Question 7

Constructors are used to create new instances of a class.

Question 8

A fractal curve is one-dimensional.

Question 9

In turtle graphics, the turtle is initially facing east.

Question 10

The setPixels method of the Turtle class changes the width of the turtle in pixels to the specified value.

Question 11

A fractal object can be described using Euclidean geometry.

Question 12

In the RGB system, the value 255 represents the total absence of that component.

Question 13

The size of a pixel is determined by the size and resolution of the display.

Question 14

In turtle graphics, the color used is initially black.

Question 15

The ticks representing seconds on the analog clock's face represent an attempt to sample moments of time as discrete values, whereas time itself is continuous, or analog.

Question 16

An attempt to manipulate a turtle whose window has been closed raises an error.

Question 17

In turtle graphics, the width of the line drawn when the turtle moves is initially 2 pixels.

Question 18

Programmers who use objects interact with them through their interfaces.

Question 19

Generally, an object's state is the set of values of its attributes at any given point in time.

Question 20

RGB stands for red, green, and black.

Question 21

What type of image compression analyzes larger regions of pixels and saves a color value that the pixels' colors approximate?

A) lossless compression
B) lossy compression
C) summary compression
D) recursive compression

Question 22

The GIF format uses a lossless compression scheme.

Question 23

The drawing of simple, two-dimensional shapes, such as rectangles, triangles, pentagons, and circles, is known as what type of graphics?

A) planar graphics
B) vector graphics
C) geometric graphics
D) targeted graphics

Question 24

A raw image file saves all of the sampled information.

Question 25

Which of the following image formats is considered to be the most popular? (Choose two.)

A) XCF
B) GIF
C) JPEG
D) SVG

Question 26

What is the maximum number of distinct color values that can be displayed by the true color RGB system?

A) 256
B) 16,384
C) 32,768
D) 16,777,216

Question 27

How does digital information differ from analog information?

A) Digital information can be represented as wave patterns, while analog information consists of bits.
B) Digital information consists of a continuous range of values, while analog is a set of discrete values.
C) Digital information consists of discrete values, while analog is a continuous range of values.
D) Digital information is commonly used in basic image and sound devices, such as recorded records, while analog is used for electronic media.

Question 28

What coordinate system is utilized for the Turtle graphics toolkit?

A) cartesian system
B) polar system
C) square system
D) fractal system

Question 29

Given a Turtle object of t, what method can you use to erase all of the turtle's drawings, without changing the state?

A) t.delete()
B) t.clear()
C) t.erase()
D) t.scratch()

Question 30

The screen coordinate system for the display of an image is somewhat different from the standard Cartesian coordinate system used with Turtle graphics.

Question 31

The Turtle graphics toolkit was originally developed as part of what programming language for children?

A) LISP
B) FORTRAN
C) Logo
D) CKids

Question 32

What statement accurately defines what a pixel is?

A) A pixel is the name for the graphical draw point of any graphics generating program.
B) A pixel is the graphical equivalent of a byte in memory, and is used to store graphics data.
C) A pixel is a graphical font, which is used to write image data onto a screen.
D) A pixel is a colored dot, also known as a picture element, that makes up part of a display.

Question 33

Programming that relies on the use of objects and methods to control complexity and solve problems is known as what type of programming?

A) access-based programming
B) object-based programming
C) serial-based programming
D) entry-based programming

Question 34

What type of method returns the values of an object's attributes without altering its state?

A) mutator methods
B) controller methods
C) accessor methods
D) positional methods

Question 35

Many image-processing algorithms use a nested loop structure to traverse a two-dimensional grid of pixels.

Question 36

In the images module, how does the Image class represent an image?

A) Using a detailed sample of the image's brightness values.
B) Using a rasterized copy of the image's color values.
C) Using a two-dimensional grid of RGB values.
D) Using a pixel map determined by grayscale values.

Question 37

What does the term "sampling" imply in relation to images?

A) The mapping of analog information in a visual format to discrete values.
B) The conversion of digital into analog information for display on a screen.
C) The process of creating analog information from digital information, for use in computer programs.
D) The utilization of a sample of data to represent a larger digital data set.

Question 38

What RGB value should you use to produce a blue color?

A) 0, 0, 0
B) 0, 255, 0
C) 255, 255, 0
D) 0, 0, 255

Question 39

The images module is a standard, open-source Python tool.

Question 40

Which of the following classes are associated with a Turtle object? (Choose two.)

A) Screen
B) Canvas
C) Plot
D) Page

Question 41

What two Turtle methods affect the color of a Turtle drawing? (Choose two.)

A) setcolor()
B) pencolor()
C) fillcolor()
D) drawcolor()

Question 42

Why is the conversion of an image to grayscale by simply computing the average of a pixel less than ideal?

A) The conversion will still contain non-grayscale colors.
B) The conversion does not take luminance into account.
C) The conversion will cause some areas of the image to be invisible
D) The conversion will make details that are red or green in color hard to see.

Question 43

A black-and-white photograph contains more than just the black and white colors, but various shades of gray known by what term?

A) grayshade
B) graymap
C) graycurve
D) grayscale

Question 44

When instantiating a class and assigning the resulting object to a variable, what is the right side of the assignment called?

A) The instantiator statement.
B) The spawner statement.
C) The constructor statement.
D) The creator statement.

Question 45

What effect does a higher DPI have on the sampling done by a digital camera?

A) It decreases the number of samples that are taken.
B) It increases the number of samples that are taken.
C) It decreases the amount of time needed for each sample.
D) It increases the amount of time needed for each sample.

Question 46

What is instantiation in Python?

A) It is the process of creating an IDLE session that utilizes a graphics window.
B) It is the process of calling a module mutator method.
C) It is the process of calling a function that returns no object.
D) It is the process of creating a class-based object.

Question 47

What is the term used to describe the processing of a multi-row, multi-column grid of information using a nested loop structure?

A) field circuit mapping
B) row-column mapping
C) row-major traversal
D) grid-centric retrieval

Question 48

When discussing an image, what is an image's aspect ratio?

A) The ratio of the image's width to its height.
B) The ratio of the image's colors to their brightness.
C) The ratio of the image's bitrate to its size.
D) The ratio of the image's color gamut to its bitrate.

Question 49

What Turtle method is used to move the Turtle object instance t to the center of the window, pointed east?

A) t.start()
B) t.home()
C) t.return()
D) t.restart()

Question 50

Assuming you have an images module object named i, what method can you use to change the pixel at coordinate 238, 590 to red?

A) i.setPixel(238, 590, (255, 0, 0))
B) i.chgPixel(590, 238, (0, 255, 0))
C) i.modPixel(238, 590, (255, 0, 0))
D) i.Pixel(238, 590, (0, 0, 255))