Assignment #2

As with the previous assignment, answer the following questions in a text file or using MS Word. That is, you may save your answers as TXT, DOC, DOCX, or RTF.  Attach your file when submitting your assignment on COL.  Your answers do not have to be lengthy—but they do have to be clear.  Some of these questions may require you to go online to do some researching on your own.

Question #1:  You create an image using a simple free piece of software (e.g. MS Paint). You set your image to be 200 pixels wide by 100 pixels high.  You save your image as a 24-bit bitmap.  What would you expect the approximate filesize of your image to be?  Show your calculations in your answer.

Question #2:  Using MS Paint, I have saved a single image 4 different ways:

-         As a monochrome (1-bit) image

-         As 24 bit grayscale

-         As 24 bit color

-         As 16 colors (not bits!) – how many bits do you need to record 16 different possible colors?

What would you expect the relative file sizes to be for these images?  Explain.

If you like, you can use a hypothetical image of 100 pixels by 100 pixels to calculate sizes for each.

(Note: You do NOT need to factor in our discussions about PCs requiring all memory to take up 1 byte of space. That is, for purposes of our discussion, you may assume that a computer is indeed capable of storing as little as 1 bit of space at a time. )

Question #3:  Go online and read about the difference between LOSSY and LOSSLESS image file formats.  Explain the difference between the two and why you might choose one over the other.  They may well be an exam question on this topic….

Question #4: Explain why an MP3 song recorded at 128 k/second (a fairly common setting) takes up about one tenth of the space of that same song as stored on a typical CD.

Question #5:  The very popular iPod has adopted the AAC audio format as its preferred standard instead of MP3.  (Although MP3s will play on iPods).  Explain why advocates of AAC feel that it is a better choice than MP3.  Mention at least three differences between those two audio formats in your discussion.