Unit 1 - Lesson 8
Color Images
To do: September 10
1) Which ASCII character is represented by �the binary number 0100 0001?
2) Write the binary sequence to encode:
HEY
3) If my friend has a collection of 78 dolls, �what is the minimum number of bits needed�to encode each doll with a unique binary� representation?
Analog Data: Data with values that change continuously, or smoothly, over time. Some examples of analog data include music, colors of a painting, or position of a sprinter during a race.
Digital Data: Data that changes in a discrete way (separate and distinct) through a finite set of possible values
Unit 1 Lesson 7 - KEY WORDS
image
image
sound
sound
Sampling: A process for creating a digital representation of analog data by measuring the analog data at regular intervals called samples.
samples
Unit 1 Lesson 7 - Wrap Up
image
sound
Unit 1 Lesson 8 - Warm Up
Shades of blue
Pixelation Widget: Color
Levels 2-6
Unit 1 Lesson 8 - Activity
Levels 7-8
Try your best to match the colors using the widget and reproduce the gradient. Don’t worry if it doesn’t match exactly!
Unit 1 Lesson 8 - Activity
Unit 1 Lesson 8 - Wrap Up
Prompt:
What happens at each level of creating a digital color image?
Hint: Think binary...
DIGITAL IMAGE LAYER
Displays a digital approximation based on a sampling of an analog image
Layers of Abstraction
in Color Images
SAMPLING LAYER
Samples of equal size are read from the analog image and assigned to pixels.
PIXEL LAYER
Each pixel is represented by levels of red, green, and blue light.
BINARY LAYER
The red, green, and blue values are represented using a sequence of
binary numbers and sent out via electrical signals.
Unit 1 Lesson 8 - Wrap Up
Unit 1 Lesson 8 - Wrap Up
QUIZ
Unit 1 Lesson 8 - Wrap Up
Homework