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From: Knute Johnson <eternal@knutejohnson.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Sepia tone image filter for Java
Date: Tue, 15 Jul 2014 10:22:01 -0700
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I like these scale factors even better

             float[] factor = new float[] { 1.35f,1f,.7f };


On 7/15/2014 10:11, Knute Johnson wrote:
> 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