Page 77 - DCAP303_MULTIMEDIA_SYSTEMS

Unit 4: Image

4.12 Keywords notes

Colour palette: A device which converts the logical colour numbers stored in each pixel of video
memory into physical colours, normally represented as RGB triplets, which can be displayed on
the monitor.

image: An image is an optical representation of an object produced by light rays from the object
being refracted or reflected by a lens or mirror.
pixels: Regular rectangular mesh of cells called pixels.

Raw files: Files stored by bitmap storage method are called RAW files.
rendering: Rendering is the process of adding realism to a computer graphics by adding three-
dimensional qualities such as shadows and variations in colour and shade.
resolution: Resolution is normally specified in pixels per inch but could be in terms of any other
unit of measure.
vector drawing: Vector drawing is created by the software and joins up the control points that
the user has drawn.

1. Give the steps to render a 3D Image.

2. Generate a colour palette using online colour palette generator.

4.13 review Questions

1. What are the bitmap images? Explain in brief.
2. What do you mean by resolution? How it is related with the bitmaps?
3. What is colour depth conversion?

4. Write a short note on bitmap storage.
5. What is the vector drawing? What are its advantages in graphics?
6. What do you mean by rendering? What is the purpose of rendering?

7. Write the brief notes on natural light and colour.
8. What do you understand by computerized colours?
9. What are the colour palettes? Write about some colour palette generators.
10. What are the image file formats? Explain about the widely used image formats.

11. Write the short notes on:
( a) Colour depth.

( b) Macintosh image.
( c) Windows Imaging (WIM) file formats.
( d) Cross-platform formats.
answers to self assessment
1. (b) 2. (c) 3. (a) 4. (d) 5. (b)

6. (c) 7. (d) 8. (b)

LoveLy professionaL University 71