Binary Images

What does the term colour depth mean?

• The number of bits used in each pixel in an image file

• The amount/density of pixels in a given space (usually an inch)

• Extra data stored with a file which contains the files properties

• Small dots that make up bitmap images

What does the term resolution mean?

• The number of bits used in each pixel in an image file

• The amount/density of pixels in a given space (usually an inch)

• Extra data stored with a file which contains the files properties

• Small dots that make up bitmap images

What does the term metadata mean?

• The number of bits used in each pixel in an image file

• The amount/density of pixels in a given space (usually an inch)

• Extra data stored with a file which contains the files properties

• Small dots that make up bitmap images

What does the term pixel mean?

• The number of bits used in each pixel in an image file

• The amount/density of pixels in a given space (usually an inch)

• Extra data stored with a file which contains the files properties

• Small dots that make up bitmap images

How is a bitmap image stored on a computer?

• An image is made up of pixels, each colour has a unique binary number, each pixel is given the binary number of its colour

• An image is made up of pixels, more pixels means a higher quality image, means a larger file size

• An image is made up of pixels, each colour has a binary number, each pixel is given the binary number of its colour

• The larger the pixels the lower quality the image will be and it can become pixelated

A colour depth of 4-bits would have how many colours?

• 2

• 4

• 8

• 16

A colour depth of 2-bits would have how many colours?

• 2

• 4

• 8

• 16

How does reducing the number of colours in an image reduce its file size?

• Fewer colours to choose from means there are less options to pick, making the image easier to store

• Fewer pixels are needed to stored the image

• Fewer bits are needed per colour, which means fewer bits per pixel