S12Exam2Solutions < CS101

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CS 101

Exam 2 Solutions
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<pre> =// method to make a 5 color posterized version of  a picture=   </pre><pre> =public static Picture q21 (Picture p)=   </pre><pre> ={=     </pre><pre> =int xPos, yPos;=      </pre><pre> =int wid = p.getWidth();=     </pre><pre> =int hgt = p.getHeight();=         </pre><pre> =// loop for all the x values=      </pre><pre> =for (  xPos = 0 ; xPos &lt; wid ; ++xPos )=     </pre><pre> ={= </pre><pre>       =// loop for the the Y values= </pre><pre>       =for ( yPos = 0 ; yPos &lt; hgt ; ++yPos )= </pre><pre>       ={= </pre><pre>         =// access a pixel= </pre><pre>         =Pixel pix = p.getPixel (xPos, yPos);= </pre><pre>         =// access the color values of that pixel= </pre><pre>         =int red = pix.getRed ();= </pre><pre>         =int green = pix.getGreen ();= </pre><pre>         =int blue = pix.getBlue ();= </pre><pre> =// modify the color values of the pixel= </pre><pre>         =int grayAmount;= </pre><pre>         =grayAmount = (int)Math.round((red * 0.299) + (green * 0.587) + (blue * 0.114)) ;                    if ( grayAmount &lt; 255 / 5 )  // 51= </pre><pre>        ={           pix.setColor ( Color.BLACK );= </pre><pre>        =}=         </pre><pre>        =else if ( grayAmount &lt; 2 * 255 / 5 )  // 102= </pre><pre>         ={           pix.setColor ( Color.BLUE );         }= </pre><pre>        =else if ( grayAmount &lt; 3 * 255 / 5 )  // 153= </pre><pre>        ={           pix.setColor ( Color.GREEN );         }= </pre><pre>         =else if ( grayAmount &lt; 4 * 255 / 5 )  // 204= </pre><pre>         ={           pix.setColor ( Color.CYAN );= </pre><pre>        =}= </pre><pre>         =else= </pre><pre>          ={           pix.setColor ( Color.WHITE);         }= </pre><pre>               =}= </pre><pre>      =}= </pre><pre>    =return p;= </pre><pre>   =}= </pre><pre>  22.</pre><pre> =// method to make a color negtive from a picture= </pre>

Topic revision: r1 - 2012-04-16 - 22:27:18 - Main.troy

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