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Monitor -
- set of picture elements (pixels) which are colored dots on the screen
- how many dots? depends on resolution (horizontal x vertical):
- 640x480, 800x600, 1024x768, etc.
- how many bits per pixel? depends on how many different colors you want in a
pixel (color depth)
- black or white
- 16 colors
- 256 colors
- ... millions of colors
how do we represent the screen in the memory?
example in black and white:
| What you see ... | What is in memory ... |
|
Video board displays the contents of the Video memory (Video Ram)
Video memory contains the color code for each pixel on the screen
How do we represent a color pixel?
Memory represents the intensity of the basic colors (Red,Green,Blue)
Suppose you use 24 bits to represent 1 pixel, 8 bits for each basic color:
| How much Red | How much Green | How much Blue | ||||||||||||||||||||||||
- How many possible different colors for each pixel?
- How many bytes to represent one pixel?
- How many bytes to represent a screen with 800x600 pixels?
- What is the color depth in this example?