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Computing revision
Final testttttt
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Moriah Popoola
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Computing revision > Final testttttt
15 cards
Cards (41)
What is a digital image?
A picture stored on a
computer
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What does it mean for an image to be digitised?
It is changed into
binary numbers
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What is a pixel?
A tiny square of
colour
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How do pixels form a digital image?
Many pixels together create the image
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What is a bitmap?
A method for storing images using
pixels
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Why is it called a bitmap?
It is a 'map' of where
bits
are stored
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What does each pixel in an image represent?
One
colour
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How are pixels stored?
As
binary values
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How is colour depth measured?
In
bits
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What does the number of bits in colour depth indicate?
How many
colours
are available for each
pixel
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What is the colour depth of a black and white image?
1 bit
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What is one way to reduce the file size of an image?
Compressing
it
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What are the advantages of reducing file size?
Faster
downloads
and more
storage capacity
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What happens with lossy compression?
Data is
permanently
removed from the file
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What is a key characteristic of a decompressed file using lossy compression?
It is an
approximation
of the original
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How does lossless compression differ from lossy compression?
There is no loss of
data
with lossless
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What happens when a file compressed with lossless compression is decompressed?
It is identical to the
original
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What does resolution measure?
Pixel density
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How is resolution usually measured?
In
dots per inch
(
dpi
)
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What is the relationship between the number of pixels and image resolution?
More
pixels mean higher resolution
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How is image file size calculated?
File Size =
Resolution
x
Colour Depth
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What is resolution in the context of image size?
Total number of
pixels
in the image
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In what units is image size typically written?
Kilobytes
or
megabytes
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What conversions are needed for image size calculations?
Bits
to
bytes
, bytes to
KB
or
MB
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colour
depth chart
In a
transposition cipher
, the
characters
remain the same but are transposed (i.e. rearranged) in some way.
The
Route Cipher
is a simple example of a transposition cipher.
READ DOWN THE COLUMNS
The
Columnar Cipher
is similar to the Route Cipher but introduces a
key word
as part of the key to control the order of the
columns
.
Key word
Order of letters
Write out
Columns in order
Rail fence cipher
Key =
4,
letters go down by 4
See all 41 cards
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