Representing images

Question 1

pixel

Answer 1

smallest unit of an image that can be changed.

picture element

Question 2

pixel. in order to store an image on a storage device=

Answer 2

.every pixel needs its colour code sorted

.metadata

Question 3

Resolution

Answer 3

number of pixels per measurement

Question 4

ppi

Answer 4

pixels per inch

Question 5

what is a bitmap

Answer 5

an image made up of pixels

Question 6

how is bitmap stored

Answer 6

as a grid of pixels

Question 7

to save a bitmap you need to store

Answer 7

. a binary code fro every pixel

.the metadata- width, height, colour depth, location, author, camera used, file name

Question 8

bitmapped format is best used for

Answer 8

.photographs
.scammed images
.any image containing regions with gradients of colour

Question 9

vector graphics (stored)

Answer 9

the image is deconstructed into individual shapes

Question 10

(difference of bitmap&vector)

Bitmap graphics

Answer 10

.made up of a grid of pixels
. can edit individual pixels
. offer high quality images
.stretched image becomes blurred
.take up a lot of storage space 
. a lot of processing

Question 11

vector graphics

Answer 11

.store details about individual components that make up image
.made up of objects defined by mathematical equations
. image quality does not depend on resolution
. can be resized without loss of quality.
.instructions
.significantly lower due to the lack of a need to store individual pixel values.

Question 12

buffering

Answer 12

.immediate storage area- buffer is used to hold the downloading segments that have not been played yet.
.buffering is used to minimise interruptions to viewing.