LAB 17 – Conditionally Modifying Pixels (part 1 – Replacing Colors)
Topics
To replace one color with another in a picture
To conditionally execute a statement or block of statements using an if statement.
6.1 Conditional Pixel Changes
Type in the following code in the Program window (changing the comments):
import java.awt.Color;
/* Program that transforms pictures using loops and conditionals
*
* Picture and Pixel classes are defined in bookClasses developed
* at Georgia Tech by Mark Guzdial / Barbara Ericson
*
* @author Wayne Summers
* @date Sept. 23, 2007
*/
public class TransformPictures
{
public static void main(String[] args)
{
String fileName1, fileName2;
System.out.println(“Find the source file”);
fileName1 = FileChooser.pickAFile(); // note that this pops up a window to select a jpg file
Picture sourcePicture;
sourcePicture = new Picture(fileName1);
// calls to methods that manipulate images go here
sourcePicture.show();
}
}
6.1.2 Replacing Colors
i) Type in the following code in the Program window below the main method and before the last }:
/**
* Method that turns brown in a source picture into red
* @param sourcePic - picture Object to be modified
*/
public static void turnBrownIntoRed (Picture sourcePic)
{
Color brown = new Color(42, 25, 15);
Pixel[] pixels = sourcePic.getPixels();
Pixel pix= null;
int len = pixels.length;
// loop through the array of pixels in the picture
for (int index = 0; index < len; index++)
{
// get the current pixel
