# 08 - Bitmap and Vector Images

1. Images are either vectors or bitmaps. Bitmap images are made out of small parts called pixels.

TRUE

FALSE

2. Vector images are made using ______________________

mathematical formulas

All of the above are valid answers

coordinates and geometry.

scalable shapes such as straight lines and curves,

3. Bitmap graphics can be scaled without losing resolution. They can be enlarged or reduced in size - but the file size will stay almost exactly the same.

FALSE

TRUE

4. One of the most common vector file formats is scalable vector graphics (____). ____is an open standard for vector graphics.

PNG

MP3

JPEG

SVG

5. When a monitor or a printer displays a vector image it is rasterised -that is _____

it is converted into a grid of pixels.

it is converted into a sequence of ASCII characters

It is deleted and re-transformed into colours

it is converted into a sequence of 256 bits

6. Bitmap images are essentially comprised of small parts called _________

resolutions

pixels

bits

colour depths

7. The colour depth of an image is measured in bits. The number of bits indicates ____________

how many pixels are available for each colour

how many colours are available for each pixel

None of the above

how many bits are available in the graphics chip

8. In a black and white image, only two colours are needed. This means it has a colour depth of___________

2 bits

3 bits

4 bits (because 4 is the minimum requirement)

1 bit

9. A 2-bit colour depth would allow ___________________________

3 values (as the notation is 2+1)

2 values: 01 and 11

1 value, as 2 is the minimum number of bits required

four different values: 00, 01, 10, 11

10. The ____________the colour depth (bits per pixel), the more colours are available.

smaller

sharper

lower

greater

11. _________________is a measure of pixel density, usually measured in dots per inch (dpi)

None of the above

Resolution

Vectorisation

Pixality

12. When might one want to decrease the colour depth for an image

When you want to save file space or when you only need a specific palate of colours such a mono-chrome

When you wish to switch to a higher resolution

When you want to increase the number of colours stored

Never

13. How many bits would an image be that has a size of 20 by 30 pixels, with each pixel able to display 8 colours?

20 x 30 = 600 bits

None of the above

h * w * b = 20 * 30 * 3 = 1800 bits

8 bits (the calculation is straightforward)

14. How many bits does the colour depth have to be if we want to store 64 colours per pixel?

12

4

8

6

15. How many colours can each pixel store if it has a colour depth of 4bits?

Two to the power of 4, which gives 16 colours

2 colours

4 colours

None of the above

16. The smallest possible addressable area defined by a solid colour, represented as binary, in an image is a _____________

image bit

resolution bit

pixel

colour bit

colour depth

file format (e.g. jpeg, svg etc)

filename

All of the above are valid answers

18. Vectors are more efficient than bitmaps at storing large areas of the same colour because they do not need to store every pixel as a bitmap does

FALSE

TRUE

19. It is possible to edit SVG images using ______________ to change the size and colour variables in HTML. This is often used for graphs and infographics in HTML5

numbers

direct CPU manipulation

ASCII characters

pixel manipulation

20. Vector graphics are used in:

All of the above are valid answers

animated movies

image manipulation programmes such as Adobe Photoshop

21. Image resolution is calculated using the:

no. of pixels x the length of the image

bits x colour depth

None of the above

pixel dimensions (e.g. height x width)

22. Display resolution is the number of dots per inch (DPI). More dots per inch give a _________________

smaller image overall

better image resolution

compressed image

blurry image

23. A pixel can be thought of as the smallest element of a digital image.

FALSE

TRUE

24. Colour depth is the number of bits used for each pixel where 1 bit is black and white and 8 bits will give _______________

16 colours

8 colours

128 colours

256 colours

25. Vector graphics can be rescaled and resized with no loss of quality. Simple shapes that can be copied to create more complex shapes.

FALSE

TRUE