Lesson 10 Lossy Compression

Lossy Compression

​Standard: DAT-1

The way that the computer represents data is different from the way that the data are interpreted and displayed for the user. Programs are used to translate data into a representation that is more easily understood by people.

​Learning Objectives

Students will be able to examine the effects of lossy compression on text & images.

Students will be able to decide whether to use lossy or lossless compression based on the needs of a situation.

Open Ended

• What do you notice about the quality of the image when you compress it?

Open Ended

• What do you notice about the compressed file size?

Multiple Choice

Which one do you lose data with?

• Lossy

• Lossless

Reflection

Open Ended

You’ve been given a new cell phone with a 2 gigabyte data plan. You plan to use your phone for text messages, images, video, and music. Which of these categories are best compressed using lossless compression? Which of these categories are best compressed using lossy compression? Why?