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Y8 - Image Binary
Y8 - Image Binary
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Slide 1:
Tekstslide
Computing
Lower Secondary (Key Stage 3)
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29 slides
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Y8 - Image Binary
Slide 1 - Tekstslide
How do you think a computer stores an image?
Slide 2 - Open vraag
How are these images different?
Slide 3 - Tekstslide
Bitmaps
Pixel based
each pixel stored as a binary number
pixelate when enlarged
Slide 4 - Tekstslide
Slide 5 - Tekstslide
Vector
coordinate based
uses calculations
will not pixelate
Slide 6 - Tekstslide
Slide 7 - Tekstslide
Slide 8 - Tekstslide
Vector Use
Slide 9 - Tekstslide
Bitmap use
Slide 10 - Tekstslide
VECTOR
BITMAP
Uses calculations
smaller in file size
larger in file size
will pixelate
uses pixels
Used for real photos
Will not pixelate
Used for maps
Slide 11 - Sleepvraag
Bit depth
How many bits allocated per pixel
Slide 12 - Tekstslide
1 bit vs 2 bit
Slide 13 - Tekstslide
How many bits per pixel is the standard in modern computers?
Slide 14 - Woordweb
RGB 24 bit colour
24 bits per pixel
8bits for red
8bits for green
8bits for blue
16.7 million options
one pixel of pure green would be 000000001111111100000000
Slide 15 - Tekstslide
a 24 bit binary number would be hard to remember. What else could we use?
Slide 16 - Open vraag
Hex makes it easier
6 digits of hex
instead of 24 binary digits
Easier to remember
Easy to convert to binary
000000 = black
FFFFFF = white
960080 = lilac
Slide 17 - Tekstslide
Try this
Put this number into google
#642240
What do you think it is?
Slide 18 - Tekstslide
Can you remember Hex to binary conversion?
Convert 642240 into binary
skills video
Slide 19 - Tekstslide
comparison
The school want a printing company to make several leaflets to advertise a school open evening event.
They could say...
"Use colour #642240"
or
"use 011001000010001001000000 !!!"
Slide 20 - Tekstslide
How many colours could you represent using a bit depth of 3
A
3
B
4
C
8
D
16
Slide 21 - Quizvraag
How many colours could you represent using a bit depth of 8
A
8
B
64
C
255
D
256
Slide 22 - Quizvraag
How many bits are assigned per channel in RGB 24 bit
A
4
B
8
C
12
D
24
Slide 23 - Quizvraag
How many digits of hexadecimal are needed to represent a 24 bit colour
A
6
B
8
C
4
D
1
Slide 24 - Quizvraag
Image resolution
Number of pixels across the height and width of the image
Density of pixels in a given area (usually dots per inch)
Slide 25 - Tekstslide
Challenge
Research the term "metadata" when linked to storing images
get some examples
Slide 26 - Tekstslide
Examples of metadata for a stored image
Slide 27 - Woordweb
Impacts
What do you think happens when you increase either the resolution and/or bit depth for an image?
Slide 28 - Tekstslide
Extension
The need for compression:
open and have a read over this (includes video)
Slide 29 - Tekstslide
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