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Groups > comp.lang.java.programmer > #29110

Re: Sepia tone image filter for Java

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On 7/15/2014 03:59, Roedy Green wrote:
> On Mon, 14 Jul 2014 11:24:10 +0200, Joerg Meier <joergmmeier@arcor.de>
> wrote, quoted or indirectly quoted someone who said :
>
>> Yes, that is typically what happens when you darken blue. On a computer
>> screen, "darken" means less of a colour ;)
>
> Of course. I was thinking in terms of paint, where adding more blue
> paint would be "darkening" the blue.
>

A sepia tone filter is trickier than I thought.  I need to compare the 
results from this code with the sepia filter in JavaFX.

import java.awt.*;
import java.awt.color.*;
import java.awt.image.*;
import java.net.*;
import javax.imageio.*;
import javax.swing.*;

public class test0 extends JPanel {
     private BufferedImage orig,sepia;

     public test0() {
         try {
             URL url = new URL(
              "http://rabbitbrush.frazmtn.com/xlsjacksonhole.jpg");
             orig = ImageIO.read(url);
             setPreferredSize(new 
Dimension(orig.getWidth(),orig.getHeight()*2));

             // convert to grayscale and back to RGB
             ColorSpace imgCS = orig.getColorModel().getColorSpace();
             ColorSpace grayCS = ColorSpace.getInstance(ColorSpace.CS_GRAY);
             ColorConvertOp cop = new ColorConvertOp(imgCS,grayCS,null);
             sepia = cop.filter(orig,null);
             cop = new ColorConvertOp(grayCS,imgCS,null);
             sepia = cop.filter(sepia,null);

             // slightly enhance the red, slightly reduce the green and
             // remove half the blue
             float[] factor = new float[] { 1.1f,.9f,.5f };
             float[] offset = new float[] { 0f,0f,0f };
             RescaleOp rop = new RescaleOp(factor,offset,null);
             sepia = rop.filter(sepia,null);
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     public void paintComponent(Graphics g2d) {
         g2d.drawImage(orig,0,0,null);
         g2d.drawImage(sepia,0,sepia.getHeight(),null);
     }

     public static void main(String... args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new JFrame("test0");
                 f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                 f.add(new test0(),BorderLayout.CENTER);
                 f.pack();
                 f.setVisible(true);
             }
         });
     }
}


-- 

Knute Johnson

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Thread

Re: Sepia tone image filter for Java jf498989@gmail.com - 2014-07-12 13:49 -0700
  Re: Sepia tone image filter for Java Roedy Green <see_website@mindprod.com.invalid> - 2014-07-14 02:12 -0700
    Re: Sepia tone image filter for Java Joerg Meier <joergmmeier@arcor.de> - 2014-07-14 11:24 +0200
      Re: Sepia tone image filter for Java Roedy Green <see_website@mindprod.com.invalid> - 2014-07-15 03:59 -0700
        Re: Sepia tone image filter for Java Knute Johnson <eternal@knutejohnson.com> - 2014-07-15 10:11 -0700
          Re: Sepia tone image filter for Java Knute Johnson <eternal@knutejohnson.com> - 2014-07-15 10:22 -0700
            Re: Sepia tone image filter for Java Knute Johnson <eternal@knutejohnson.com> - 2014-07-17 18:53 -0700
            Re: Sepia tone image filter for Java Jeff Higgins <jeff@invalid.invalid> - 2014-07-19 08:18 -0400

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