Exam 2 Solutions

1. D
2. D
3. D
4. A
5. A
6. E
7. A
8. C
9. B
10. A
11. C
12. C
13. A
14. B
15. B
16. A
17. C
18. D
19. A
20. C

21. ---

 =// method to make a 5 color posterized version of  a picture=   

 =public static Picture q21 (Picture p)=   

 ={=     

 =int xPos, yPos;=      

 =int wid = p.getWidth();=     

 =int hgt = p.getHeight();=         

 =// loop for all the x values=      

 =for (  xPos = 0 ; xPos < wid ; ++xPos )=     

 ={= 

       =// loop for the the Y values= 

       =for ( yPos = 0 ; yPos < hgt ; ++yPos )= 

       ={= 

         =// access a pixel= 

         =Pixel pix = p.getPixel (xPos, yPos);= 

         =// access the color values of that pixel= 

         =int red = pix.getRed ();= 

         =int green = pix.getGreen ();= 

         =int blue = pix.getBlue ();= 

 =// modify the color values of the pixel= 

         =int grayAmount;= 

         =grayAmount = (int)Math.round((red * 0.299) + (green * 0.587) + (blue * 0.114)) ;                    if ( grayAmount < 255 / 5 )  // 51= 

        ={           pix.setColor ( Color.BLACK );= 

        =}=         

        =else if ( grayAmount < 2 * 255 / 5 )  // 102= 

         ={           pix.setColor ( Color.BLUE );         }= 

        =else if ( grayAmount < 3 * 255 / 5 )  // 153= 

        ={           pix.setColor ( Color.GREEN );         }= 

         =else if ( grayAmount < 4 * 255 / 5 )  // 204= 

         ={           pix.setColor ( Color.CYAN );= 

        =}= 

         =else= 

          ={           pix.setColor ( Color.WHITE);         }= 

               =}= 

      =}= 

    =return p;= 

   =}= 

  22.

 =// method to make a color negtive from a picture=