What to do

Read chapter 7 , Web Graphics, pages 151-190, from the class text Web Style Guide by Lynch and Horton.

Copy and paste the questions below in to a new blog entry entitled "Web Graphics". Answer the questions in the manner described below.

Example

The answers I am looking for are not single word answers. I am looking for a paragraph which addresses all aspects of the question. Each question simply follows the associated section in the text.

For example:

What is the "Browser Safe" color palette about? (10 points)

The 'browser safe' palette solves the problem of displaying 8-bit, 256, color images on different OS platforms. An 8-bit monitor (strictly speaking, the graphics card) will only display a maximum of 256 colours, but these are slightly different between Windows and Mac OS. Windows reserves 40 colors for it's own display. Netscape originated a 216 color 'browser safe' palette which will display the same colors on the Mac as on Windows. Finally, with the advent of 16 and 24 bit displays this is no longer such a big problem since millions of colours can now be displayed.

Questions
  1. What does dithering do? What are the problems with this and how does it relate to the color palette (10 points)

  2. Why is GIF the most popular graphics format on the web? (10 points)

  3. What are the advantages and disadvantages of the JPEG format for web graphics? (10 points)

  4. Color is displayed differently on the screen and by a color printer. How? Why does the computer screen display colours as well as the printer? (10 point)

  5. In displaying an image with HTML why use height and width tags? How are colors represented with HTML? What do you need to look out for when using a background color or pattern? (10 point)