?? thresholdfilter.java
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import java.awt.Color;/** * An three-level gray-based threshold filter. * * @author Michael Kolling and David J Barnes * @version 1.0 */public class ThresholdFilter extends Filter{ /** * Constructor for objects of class ThresholdFilter. * @param name The name of the filter. */ public ThresholdFilter(String name) { super(name); } /** * Apply this filter to an image. * * @param image The image to be changed by this filter. */ public void apply(OFImage image) { int height = image.getHeight(); int width = image.getWidth(); for(int y = 0; y < height; y++) { for(int x = 0; x < width; x++) { Color pixel = image.getPixel(x, y); int brightness = (pixel.getRed() + pixel.getBlue() + pixel.getGreen()) / 3; if(brightness <= 85) { image.setPixel(x, y, Color.BLACK); } else if(brightness <= 170) { image.setPixel(x, y, Color.GRAY); } else { image.setPixel(x, y, Color.WHITE); } } } }}
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