Photoshop

Digital Graphics

Review Questions

What colour space is used for digital graphics?
Explain the major differences between a bitmap graphic and a vector graphic?
What image resolution would a digital graphic require on a Web site typically? Why?
Why would a JPEG file format be chosen instead of a GIF file format?
What is a pixel?
What determines the size that an image will display on a computer monitor?
What does the term 'resolution-dependent' mean?
Give some examples of bitmap file formats.
How is digital image resolution measured?
Will the resolution of an image affect its file size when it has been saved in a format compatible with displaying on the Web?
What is a colour space?
What is gamut?
Describe the RGB colour space.
What characteristic determines how many colours an image can contain?
What are the three bitmap formats supported for use on the Web?
Name some of the features supported by the GIF89a format.
Which image format would be the most suitable for images containing areas of solid colour and with few colours, such as logos, cartoons and buttons?
What bit depth do JPEG images have and how many colours are supported?
Which bitmap format(s) for use on the Web support transparency?
Describe the vector image format.

Bonus Questions

Can you name other colour spaces and identify the differences between them and the RGB colour space?
What compression scheme is used in the TIFF file format?
Would the PNG file format be better than a JPEG or GIF file format? Describe why.
What three elements must be present in order to see colour?

Review Answers

To help you determine if you are on the right track, the answers to the Review and Bonus questions have been provided. Do all the work on the questions page before you take a look at the answers.

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