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Picture Lab
Manipulating Pictures
• Discussion and activities with
java.awt.Color introduce students to
megapixels, pixels, the RGB color model,
binary numbers, bit, and byte.
• Processing individual pixels involves 2D array
concepts: row-major order, column-major
order, array of arrays, and nested loops.
• And more…
Intro to digital pictures and color
• 20 minutes – 1 hour
Picking a color
• Students practice
making different
colors using
combinations of red,
green, and blue light
using a
JColorChooser.
• 20 minutes – 1 hour
Exploring a picture
• PictureExplorer tool
• Pixelation
• 20 minutes
– 1 hour
Two-dimensional arrays in Java
(Optional activity)
• Students write methods for 2D array of
integers.
0
1
2
3
– Declare 2D array
0
1
2
– Create 2D array
1
4
5
6
– Get or set elements
– Get number of rows/columns
– Traverse in row-major and column-major order
• 30 minutes – 1 hour
Modifying a picture
• OOP Concepts
• 1 – 2 hours
Mirroring
• Loop through a range of rows and columns.
• 1 – 2 hours
0
0
1
2
1
2
3
4
Mirroring part of a picture
• Loop through a range of rows and columns.
• 1 hour
Creating a collage
•
•
•
•
Overload copy method
Modifying
Mirror the resulting collage.
1 – 3 hours
Collage with
vertical
mirror
Simple edge detection
• Calculate color difference with distance
formula
• 1 – 3 hours
Extensions – in Teacher Guide
• Steganography
• Chroma key