Tutorial Exercise 1
CS3162 Introduction to Computer Graphics
Helena Wong, 2001
1. Do you understand each of the followings:
r Frame
_________________________________________________
r Frame rate
_________________________________________________
r Pixel
_________________________________________________
r Bitmap
_________________________________________________
r 24-bits per pixel _________________________________________________
2. The coloring in computer images is the same as the composition of lights. Try to guess the
composition of :
Result Color
Red
White
Black
Yellow
Pink
Purple
Color level of each channel
Red
Green
Blue
255
0
0
3. What are the purposes of a screen saver. Which one is most important?
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
4. Consider 3 different raster systems with resolutions of 640x480, 1280x1024, 2560x2048. What
size frame buffer (in bytes) is needed for each of these systems to store 12 bits per pixel? How
much storage is required for each system if 24 bits per pixel are to be stored?
5. Consider a raster system with resolution of 640x480. How many pixels could be accessed per
second in this system by a display controller that refreshes the screen at a rate of 60 frames per
second? What is the access time per pixel in this system?
6. What is the fraction of the total refresh time per frame spent in retrace of the electron beam for a
noninterlaced raster system with a resolution of 1280x1024, a refresh rate of 60 Hz, a horizontal
retrace time of 5 microseconds, and a vertical retrace time of 500 microseconds?
1