Representing Images Flashcards
What are images made of?
Tiny elements called pixels (picture elements).
What are bitmaps?
A type of image made of an organised grid of coloured squares called pixels.
What happens to image quality when bitmaps are scaled?
Image loses quality
What are vectors?
A type of image that uses coordinates and geometrical shapes such as lines and curves to define an image.
What happens to image quality when vectors are scaled?
Image quality is not lost
How are bitmap images displayed?
Images are displayed as a grid of pixels
How are vector images displayed?
A vector image is rasterised or converted to a grid of pixels for display
What is colour depth?
Colour depth is the number of bits used to indicate different colours of a pixel.
True or False: With the increase in colour depth, the size of the file decreases.
False. With the increase in colour depth, the size of the file also increases.
What is resolution?
Resolution is the number of pixels or dots in a unit.
What units measure resolution?
Dots per inch or pixel per inch.
How do you estimate size of an image file?
Width (pixels) × height (pixels) × colour depth (bits per pixel)
What is metadata?
Metadata is ‘data about data’.
List some information stored by metadata of an image file.
Filename and format,
dimensions, resolution & colour depth of the image, date and place when the photo was taken, and camera settings when the photo was taken.
