Image Knowledge

Question 1

What is a Bitmap?

Answer 1

A collection of bits that form an image. The image consists of a matrix of individual pixels that all have their own color.

Question 2

What is a Pixel?

Answer 2

The smallest possible addressable area defined by a solid color, represent as binary in an image. Picture element.

Question 3

What is a bitmap header?

Answer 3

A block of bytes that is at the start of of a file and is used to identify the file.

Question 4

What is kept in a Bitmap header?

Answer 4

1. The file type
2. File size
3. Location of image within a file
4. Dimensions of an image (image resolution)
5. Colour depth
6. Type of compression

Question 5

What are Vector images?

Answer 5

Images defined using mathematics and geometry such as points, lines, curves and shapes or polygons. Allowing for scalability. Objects and properties stored mathematically.

Question 6

What is a drawing list with vector images?

Answer 6

A set of commands used to define a vector image.

Question 7

Drawing objects and properties.

Answer 7

Vector graphics are made up of objects and their properties. An object is a mathematical or geometrically defined construct such as a rectangle, line or circle.

Question 8

What is image resolution?

Answer 8

The amount of pixels and image contains per inch/cm.

The more pixels used the the more detailed the image resulting in higher resolution.

Question 9

What is screen resolution?

Answer 9

Tells you how many pixels you screen can display horizontally and vertically.

Question 10

The higher the resolution…

Answer 10

the more pixels used giving a crisper picture.

Question 11

What is color depth?

Answer 11

The number of bits used to represent the color of a single pixel. An increase in this leads to larger file size.