ACARA 7-8 Digital Technologies: Representing images
Students learn how images are stored as pixels with colour values, from black-and-white grids to RGB colour, colour depth, resolution and raster versus vector images.
One content description (AC9TDI8K03, AC9TDI8K04) from the full ACARA Digital Technologies Years 7–8 — Representing Text, Images and Sound journey. All 22 modules below are in that journey too, with the same content — add just these to a class, or the whole strand.
Modules (22)
1
Representing images with pixels
2
Reading a pixel grid row by row
3
Encoding a black-and-white image as 0s and 1s
4
Decoding 0s and 1s into an image
5
One bit gives two colours
6
Two bits give four shades: greyscale
7
More colours need more binary digits
8
Raster (bitmap) images
9
The RGB colour model
10
RGB values from 0 to 255
11
Reading RGB values for common colours
12
Black, white and greys in RGB
13
Inspecting a pixel's RGB numbers
14
Colour depth
15
Number of colours from the colour depth
16
24-bit colour: three bytes per pixel
17
Writing an RGB colour in binary
18
Image resolution
19
Counting the pixels in an image
20
Encoding and decoding a small colour image
21
Vector images
22
Comparing raster and vector images
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