SaveImage.java
import java.io.*; import java.util.TreeSet; import java.awt.*; import java.awt.event.*; import java.awt.geom.AffineTransform; import java.awt.image.*; import javax.imageio.*; import javax.swing.*; public class SaveImage extends Component implements ActionListener { String descs[] = { "Original", "Convolve : LowPass", "Convolve : Sharpen", "LookupOp", }; int opIndex; private BufferedImage bi, biFiltered; int w, h; public static final float[] SHARPEN3x3 = { // sharpening filter kernel 0.f, -1.f, 0.f, -1.f, 5.f, -1.f, 0.f, -1.f, 0.f }; public static final float[] BLUR3x3 = { 0.1f, 0.1f, 0.1f, // low-pass filter kernel 0.1f, 0.2f, 0.1f, 0.1f, 0.1f, 0.1f }; public SaveImage(String filename) { try { bi = ImageIO.read(new File(filename)); w = bi.getWidth(null); h = bi.getHeight(null); if (bi.getType() != BufferedImage.TYPE_INT_RGB) { BufferedImage bi2 = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics big = bi2.getGraphics(); big.drawImage(bi, 0, 0, null); biFiltered = bi = bi2; } } catch (IOException e) { System.out.println(filename + " not found"); System.exit(1); } } public Dimension getPreferredSize() { return new Dimension(w, h); } String[] getDescriptions() { return descs; } void setOpIndex(int i) { opIndex = i; } public void paint(Graphics g) { filterImage(); g.drawImage(biFiltered, 0, 0, null); } int lastOp; public void filterImage() { BufferedImageOp op = null; if (opIndex == lastOp) { return; } lastOp = opIndex; switch (opIndex) { case 0: biFiltered = bi; /* original */ return; case 1: /* low pass filter */ case 2: /* sharpen */ float[] data = (opIndex == 1) ? BLUR3x3 : SHARPEN3x3; op = new ConvolveOp(new Kernel(3, 3, data), ConvolveOp.EDGE_NO_OP, null); break; case 3 : /* lookup */ byte lut[] = new byte[256]; for (int j=0; j<256; j++) { lut[j] = (byte)(256-j); } ByteLookupTable blut = new ByteLookupTable(0, lut); op = new LookupOp(blut, null); break; } /* Rather than directly drawing the filtered image to the * destination, filter it into a new image first, then that * filtered image is ready for writing out or painting. */ biFiltered = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); op.filter(bi, biFiltered); } /* Return the formats sorted alphabetically and in lower case */ public String[] getFormats() { String[] formats = ImageIO.getWriterFormatNames(); TreeSet<String> formatSet = new TreeSet<String>(); for (String s : formats) { formatSet.add(s.toLowerCase()); } return formatSet.toArray(new String[0]); } public void actionPerformed(ActionEvent e) { JComboBox cb = (JComboBox)e.getSource(); if (cb.getActionCommand().equals("SetFilter")) { setOpIndex(cb.getSelectedIndex()); repaint(); } else if (cb.getActionCommand().equals("Formats")) { /* Save the filtered image in the selected format. * The selected item will be the name of the format to use */ String format = (String)cb.getSelectedItem(); /* Use the format name to initialise the file suffix. * Format names typically correspond to suffixes */ File saveFile = new File("savedimage."+format); JFileChooser chooser = new JFileChooser(); chooser.setSelectedFile(saveFile); int rval = chooser.showSaveDialog(cb); if (rval == JFileChooser.APPROVE_OPTION) { saveFile = chooser.getSelectedFile(); /* Write the filtered image in the selected format, * to the file chosen by the user. */ try { ImageIO.write(biFiltered, format, saveFile); } catch (IOException ex) { } } } }; public static void main(String args[]) { String filename = "bld.jpg"; if (args.length>0) filename = args[0]; JFrame f = new JFrame("Save Image Sample"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); SaveImage si = new SaveImage(filename); f.add("Center", si); JComboBox choices = new JComboBox(si.getDescriptions()); choices.setActionCommand("SetFilter"); choices.addActionListener(si); JComboBox formats = new JComboBox(si.getFormats()); formats.setActionCommand("Formats"); formats.addActionListener(si); JPanel panel = new JPanel(); panel.add(choices); panel.add(new JLabel("Save As")); panel.add(formats); f.add("South", panel); f.pack(); f.setVisible(true); } }
Maintained by John Loomis, updated Sun Oct 06 17:42:54 2013