Overview

Students explore methods for encoding digital images in binary which requires representing metadata such as width and height as well as pixel data. Students use the the Pixelation widget to encode simple B&W raster images.

Vocab

• Image - A type of data used for graphics or pictures.
• metadata - is data that describes other data. For example, a digital image may include metadata that describe the size of the image, number of colors, or resolution.
• Pixel - short for "picture element", the fundamental unit of a digital image, typically a tiny square or dot that contains a single point of color of a larger image.

Resources

• B&W Pixelation Widget - Activity Guide (copy as MS Word, Google Doc)

• Extension: Magnify an Image (optional) - Activity Guide (copy as MS Word, Google Doc)

• B&W Pixelation Tutorial - Video (download)

• Invent a B&W image encoding scheme - Activity Guide (copy as MS Word, Google Doc)