Compression Let’s take a look at compression. Take the file Fig 05-15 which can

Question

Compression

Let’s take a look at compression.

Take the file Fig 05-15 which can be found on the author’s website (http://facweb.cs.depaul.edu/cwhite (Links to an external site.)) under The Textbooks I’ve Written - Chapter Updates - Chapter Five.

Download the three files referencing using it with Lab#1.

What is the format of the file? Is this a compressed format? What is the size of the file in bytes?

Right click on the file and Send To - Compressed (Zipped) Folder. Now examine the compressed file (folder). What is the size of the file in bytes?

By what percentage was the file reduced? (Old Size – New Size) / Old Size

Now let’s take the file Chapter 5_Draft(2) from the same webpage.

What is the format of the file? Is this a compressed format? What is the size of the file in bytes?

Right click on the file and Send To - Compressed (Zipped) Folder. Now examine the compressed file (folder). What is the size of the file in bytes?

By what percentage was the file reduced?

Finally, take the file CPI from the same webpage.

What is the format of the file? Is this a compressed format? What is the size of the file in bytes?

Right click on the file and Send To - Compressed (Zipped) Folder. Now examine the compressed file (folder). What is the size of the file in bytes?

By what percentage was the file reduced?

Explanation / Answer

Find the analytics results below :

1) File format : BMP
Compressed format : No
Size before compression : 449,444 bytes
Size after compression : 29,141 bytes

File reduced in %: (Old Size – New Size) / Old Size x 100% = (449,444 - 29,141) / 449,444 x 100% = 93.5% Reduced

2) File format : DOC
Compressed format : No
Size before compression : 197,120 bytes
Size after compression : 43,389 bytes

File reduced in %: (Old Size – New Size) / Old Size x 100% = (197,120 - 43,389) / 197,120 x 100% = 77.98% Reduced

3) File format : XLS
Compressed format : No
Size before compression : 32,768 bytes
Size after compression : 6,653 bytes

File reduced in %: (Old Size – New Size) / Old Size x 100% = (32,768 - 6,653) / 32,768 x 100% = 79.69% Reduced

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