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WorksheetsiGCSE Computer Science: Digital Image Representation
Total questions: 12
Worksheet time: 6mins
Pixels get their colour from a combination of which colours?
cyan magenta yellow black
red green blue
primary colours
black white
Which factors affect the file size of a bitmap image? (select all that apply)
pixel density
image dimensions
colour depth
software used to create it
format of image meta-data
If an image has a colour depth of 8 bits then the number of possible colour shades is ... ?
256
8
16
2014
If an image has a colour depth of 65,536 colours, then the number of bits used to represent each pixel is ...
64
10
8
16
The True Color bitmap standard uses 24 bits to represent every pixel. How many possible colour shades does this allow?
16,777,216
65,536
24
48
Which of these image file formats involves lossy compression?
.gif
.png
.jpg
.bmp
Which of these image file formats involves lossless compression? (select all that apply)
.gif
.png
.jpg
.bmp
Which image file format is uncompressed?
.bmp
.png
.jpg
.gif
The density of pixels in an image is measured by ...?
pixels per inch
dots per cm
pixels per cm
width * height
What is the correct term for the amount of pixels that make up a digital image?
pixellation
resolution
resolvation
density
Pixels are normally stored using three RGB colour values that can range from 0 up to ...
7
256
255
16,700,000
What are the smallest elements of a digital image called?
colors
bits
dots
pixels
