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20 Cards in this Set

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What is the maximum number of colours in a 8-bit colour image?
256 colours
Describe a bitmap graphic.
A representation, consisting of rows and columns of dots, of a graphics image in computer memory
Describe a vector graphic.
Refers to software that uses mathematical formulae to represent images
How does dithering work?
Dithering mixes available colours in the palette to create a colour not in the palette
What colour system is used for screen based graphics?
RGB (Red, Green, Blue)
What is a colour palette?
A palette is the set of available colors.
What is lossy compression?
A way of reducing an image file size by removing some of the image detail.
Why would an image be “cropped”.
So that only the relevant area is displayed therefore reducing file size
Give a practical use for using the Blur filter.
To blur the background of an image so the foreground is more prominent
Which tool is commonly used to remove scratches from a photograph?
Clone Tool
Which type of compression is used in a GIF image.
LZW or String-table compression
Why does anti-aliasing often produce better images?
Anti-aliasing adds intermediate shades of colour between the two main colours involved.
What happens when an interlaced image is displayed in a browser?
Parts of the graphic are displayed as the image is downloaded gradually building up the full image.
Why is scaling a vector image more accurate than scaling a bitmap?
Since vector images are mathematical algorithms there is no loss of quality
Give a practical example of an image created by a drawing package.
A map/gif animation/web button/icon – any other suitable answer
What is the Pen tool used for?
Creating irregular shapes especially with straight and curved lines.
Why is using layers useful in creating an image?
Some layers can be hidden to avoid accidental selection.
Why would a transparent GIF be used on a web page?
So that there is no visible rectangular block around the image
Why is a drawing package better at creating text than a paint package?
Text can follow a path in a drawing package.(or)
Text can be edited easier in a drawing package
What does the levels filter adjust?
The tonal range of highlights, midtones and shadows