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Media Editing Lesson Plan
Lesson:3 - Data Measurement, compressed and uncompressed file formats.)

Purpose: Students should learn data measurement and size of files. Students will learn compressed file formats and uncompressed file formats. They will also touch upon lossy and lossless compressions.

No. of. Classes

1 - (Time : 1:30 minutes, Laptops/desktops : 10, Students strength : 15 to 20).

Materials Required

Laptops/desktops.

Curriculum Content 1.2) Data Measurement, 1.3) File size,
1.5) Compressed vs      uncompressed file      formats

Prior knowledge

Students should know about file, file extension and network.

Exercises

Exercise:1


1.a) Students learn about data measurement.

1.b) Students find out the size of the image in the solution folder.

1.c) They learn to convert 2 MB to GB and 2048 KB to MB.

Exercise:2


2. Students compress files/folders and see the impact of it. And they are given    a few compressed file formats.

Exercise:3


3. If we compress a file/folder will its size decrease or increase? How does it decrease? Try compressing different types of files. See how there is a wide variation in how much it compresses. Try both winzip and winrar to compress. If on a Linux system you can also try gzip. Show that the size of the resulting file is different.

Exercise:4


4. Create a BMP file (with Paint?). Convert it to jpg. See the compression. Zoom and show that they are not exactly the same! You may also do Wav to MP3 conversion. Explain that these are lossy compressions.

Solutions



Teacher's Instruction
  1. Ask the students to convert KB to MB, MB to GB, GB to TB vice versa.
  2. Ask them whether they understood bits and bytes.
  3. How 2^10 = 1024 which is close to 1000 and these two numbers are used interchangeably in referring to Kilo, Mega etc.
  4. Students should be able to understand the compressed file formats and uncompressed file formats.
  5. Ask the children to think about when you would use lossy and lossless compressions. And why do you use compression in general? Teacher should explain this.
  6. Can you then think of how the various compressions work? No need to answer this question. This is well beyond this curriculum. Some broad ideas like Run-Length-Encoding and same color in proximity can be given.