Questions from class.

20/3/2012

(week 6)

This was another informative class.

The following are a few questions left with us to explain and post online for Brian to revievew.

a) Explain the difference in the sizes of the two TIFF files in steps 1 and 2.

The original tiff file was saved with  the maximum amount of information recorded whereas the LZW compressed tiff file has had the maximum amount of information reduced somewhat according to a computer algorythum that determines how much information can be ignored in order to retail an image that is as close as possible to the original, but at a reduced file size.

b) When saving a jpeg file, what two things change when you select a different quality factor?

The two factors that come into play here are a certain amount of data (colour imformation) is discarded and this results in a smaller file size.

c) What is 'dithering' and why is it see?

A process of placing different-coloured pixels next to one another to create the illusion of additional colours. The eye sees the two adjacent colours, and the mind blends them into a third colour.

d) Explain the difference in size between the greyscale tiff file and the original tiff file.

umm

D.