What is LessonUp
Search
Channels
Log in
Register
‹
Return to search
Y8 - Image Binary
Y8 - Image Binary
1 / 29
next
Slide 1:
Slide
Computing
Lower Secondary (Key Stage 3)
This lesson contains
29 slides
, with
interactive quizzes
and
text slides
.
Start lesson
Save
Share
Print lesson
Items in this lesson
Y8 - Image Binary
Slide 1 - Slide
How do you think a computer stores an image?
Slide 2 - Open question
How are these images different?
Slide 3 - Slide
Bitmaps
Pixel based
each pixel stored as a binary number
pixelate when enlarged
Slide 4 - Slide
Slide 5 - Slide
Vector
coordinate based
uses calculations
will not pixelate
Slide 6 - Slide
Slide 7 - Slide
Slide 8 - Slide
Vector Use
Slide 9 - Slide
Bitmap use
Slide 10 - Slide
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 - Drag question
Bit depth
How many bits allocated per pixel
Slide 12 - Slide
1 bit vs 2 bit
Slide 13 - Slide
How many bits per pixel is the standard in modern computers?
Slide 14 - Mind map
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 - Slide
a 24 bit binary number would be hard to remember. What else could we use?
Slide 16 - Open question
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 - Slide
Try this
Put this number into google
#642240
What do you think it is?
Slide 18 - Slide
Can you remember Hex to binary conversion?
Convert 642240 into binary
skills video
Slide 19 - Slide
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 - Slide
How many colours could you represent using a bit depth of 3
A
3
B
4
C
8
D
16
Slide 21 - Quiz
How many colours could you represent using a bit depth of 8
A
8
B
64
C
255
D
256
Slide 22 - Quiz
How many bits are assigned per channel in RGB 24 bit
A
4
B
8
C
12
D
24
Slide 23 - Quiz
How many digits of hexadecimal are needed to represent a 24 bit colour
A
6
B
8
C
4
D
1
Slide 24 - Quiz
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 - Slide
Challenge
Research the term "metadata" when linked to storing images
get some examples
Slide 26 - Slide
Examples of metadata for a stored image
Slide 27 - Mind map
Impacts
What do you think happens when you increase either the resolution and/or bit depth for an image?
Slide 28 - Slide
Extension
The need for compression:
open and have a read over this (includes video)
Slide 29 - Slide
More lessons like this
Binary Image Representation
March 2023
- Lesson with
23 slides
Computing
Lower Secondary (Key Stage 3)
C4 - Soorten afbeeldingen
December 2023
- Lesson with
40 slides
Informatica
Middelbare school
vwo
Leerjaar 4
C4 - Soorten afbeeldingen
February 2022
- Lesson with
22 slides
Informatica
Middelbare school
vwo
Leerjaar 4
C4 - Soorten afbeeldingen
July 2022
- Lesson with
20 slides
Informatica
Middelbare school
vwo
Leerjaar 4
Nat 5 Computing - Data Representation
March 2023
- Lesson with
12 slides
Computing
Upper Secondary (Key Stage 4)
GCSE
C4 - Soorten afbeeldingen
December 2023
- Lesson with
30 slides
Informatica
Middelbare school
vwo
Leerjaar 4
Les 4 C4 - Beeld en geluid
August 2023
- Lesson with
34 slides
Informatica
Middelbare school
vwo
Leerjaar 4
Les 9: C4 - beeld- en geluidrepresentatie
December 2022
- Lesson with
17 slides
Informatica
Middelbare school
vwo
Leerjaar 4