NEW
Font size
S
M
L
XL
WorksheetsImage Capture
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
What is a pixel?
a)
It is an animated object in a game that can move or collide with other objects
b)
It is a single coloured 'dot' in a bitmap image
c)
It is a pair of coordinates that tell the computer where to draw a point on the screen
d)
A film by Columbia Pictures
2.
Why are vector files often high quality, even when you zoom in or out of the image?
a)
Because the precise position of each part of the image can be recalculated using the coordinates and mathematical formulae
b)
Because engineers and people that use vector files often use more powerful computers than people at home
c)
Because screens and printers are much more detailed than they used to be
3.
What is resolution?
a)
It is the total number of pixels in an image
b)
It is a measure of how many pixels are used in a given area
c)
It is a measure of how much an image has been compressed
d)
It is a measure of how big an object is
4.
What does 'dpi' mean?
a)
The number of colours supported by the image format
b)
The number of dots that can be plotted each second on a screen or printer
c)
The number of digits per item
d)
The number of dots used per horizontal inch in the image
5.
Why do bitmap images often appear blocky if you enlarge them too much?
a)
Because there is only a limited amount of detail in the bitmap image
b)
Because of rounding errors in the calculations for the coordinates and formulae being used to draw the image
c)
Because adding new pixels to the image would take up all of the computer's memory as you zoom in
d)
The computer is unable to correctly display it
6.
What is the 'colour depth' of a raster image?
a)
The number of alternative colours that a pixel can use
b)
The width of the image measured in pixels
c)
The number of different colours actually used in the image
d)
The bitrate of the image
7.
Which compressed file format is often used for storing digital camera images?
a)
JPG
b)
SVG
c)
BMP
d)
MP4
8.
Which of these is NOT true about compressing an image using JPG?
a)
The file size of the compressed image is always much smaller than the original image
b)
The image may lose some details that are not actually visible to the human eye
c)
JPG can compress photographs better than it can with diagrams containing large blocks of the same colour
d)
LZW is a lossy JPG compression
9.
What is metadata?
a)
Data that is stored in the computer's RAM
b)
Data that is downloaded from photo-sharing websites
c)
Data that describes other data, eg how it is structured or organised
d)
Data stored in cookies
10.
Which of these formats uses lossless compression?
a)
GIF
b)
JPG
c)
PNG
d)
MP3
Reset
