Image Storage

Question 1

What are bitmap images?

Answer 1

• Made of pixels (single colour squares arranged on grid).
• Each pixel is assigned a binary value which represents the colour of that pixel.

Question 2

Quality of bitmap images:

Answer 2

• Depends on the total amount of pixels (resolution).
• Scaling a bitmap image up results in a loss of quality.
• Photos/screenshots are bitmap images.

Question 3

Define resolution:

Answer 3

• The total amount of pixels.

Question 4

Vector Images:

Answer 4

• Are drawn by the computer following precise mathematical instructions to create liens and objects.
• Usually smaller in file size compared to big maps because each pixel in a bitmap is stored as an individual binary value.

Question 5

Quality of vector images:

Answer 5

• Can be scaled up without any loss of quality.
• Logos and Animations

Question 6

File Size of a Bitmap calculation -

Answer 6

Resolution * Colour Depth

Question 7

Metadata includes:

Answer 7

• Height in pixels
• Width in pixels
• Colour depth
• Resolution
• Geolocation
• Date created
• Last edited
• File type
• Author details.

Question 8

Why is metadata important?

Answer 8

So the image can be displayed correctly.