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Re: Sepia tone image filter for Java

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  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

#29076 — Re: Sepia tone image filter for Java

On Monday, June 29, 2009 11:03:09 PM UTC-7, Macky G wrote:
> After spending hours searching the web and not finding an answer, I
> finally put together a function to create sepia images with Java.
> This function produces amazing results, I'm very happy with it.  I
> hope it saves everyone time...
> 
> (You'll need your image to be in a BufferedImage object.  The web has
> plenty of tutorials for that.)
> 
> 
> /**
>    *
>    * @param img Image to modify
>    * @param  sepiaIntensity From 0-255, 30 produces nice results
>    * @throws Exception
>    */
> public static void applySepiaFilter(BufferedImage img, int
> sepiaIntensity) throws Exception
> {
>   // Play around with this.  20 works well and was recommended
>   //   by another developer. 0 produces black/white image
>   int sepiaDepth = 20;
> 
>   int w = img.getWidth();
>   int h = img.getHeight();
> 
>   WritableRaster raster = img.getRaster();
> 
>   // We need 3 integers (for R,G,B color values) per pixel.
>   int[] pixels = new int[w*h*3];
>   raster.getPixels(0, 0, w, h, pixels);
> 
>   //  Process 3 ints at a time for each pixel.  Each pixel has 3 RGB
> colors in array
>   for (int i=0;i<pixels.length; i+=3)
>   {
>     int r = pixels[i];
>     int g = pixels[i+1];
>     int b = pixels[i+2];
> 
>     int gry = (r + g + b) / 3;
>     r = g = b = gry;
>     r = r + (sepiaDepth * 2);
>     g = g + sepiaDepth;
> 
>     if (r>255) r=255;
>     if (g>255) g=255;
>     if (b>255) b=255;
> 
>     // Darken blue color to increase sepia effect
>     b-= sepiaIntensity;
> 
>     // normalize if out of bounds
>     if (b<0) b=0;
>     if (b>255) b=255;
> 
>     pixels[i] = r;
>     pixels[i+1]= g;
>     pixels[i+2] = b;
>   }
>   raster.setPixels(0, 0, w, h, pixels);
> }
Hi: this code works super good. I have converted it to BBC Bacic for Windows. what is your full name as I like to pass on credit to my group where due.
Thank you John Fortier

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#29092

On Sat, 12 Jul 2014 13:49:16 -0700 (PDT), jf498989@gmail.com wrote,
quoted or indirectly quoted someone who said :

> // Darken blue color to increase sepia effect

Hmm. I thought sepia added a brown tone, e.g. more yellow and red.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
A program is only as good as its worst piece of code.
~ Joshua Cramer

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#29093

On Mon, 14 Jul 2014 02:12:48 -0700, Roedy Green wrote:

> On Sat, 12 Jul 2014 13:49:16 -0700 (PDT), jf498989@gmail.com wrote,
> quoted or indirectly quoted someone who said :
>> // Darken blue color to increase sepia effect
> Hmm. I thought sepia added a brown tone, e.g. more yellow and red.

Yes, that is typically what happens when you darken blue. On a computer
screen, "darken" means less of a colour ;)

Liebe Gruesse,
		Joerg

-- 
Ich lese meine Emails nicht, replies to Email bleiben also leider
ungelesen.

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#29107

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.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
Science is what we understand well enough to explain to a computer.
Art is everything else we do. 
~ Donald Ervin Knuth (born: 1938-01-10 age: 76)

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#29110

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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#29111

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

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#29116

On 7/17/2014 18:34, Stefan Ram wrote:
> Knute Johnson <eternal@knutejohnson.com> writes:
>> I like these scale factors even better
>> float[] factor = new float[] { 1.35f,1f,.7f };
>
> docs.oracle.com/javafx/2/api/javafx/scene/effect/SepiaTone.html
>

Thanks

-- 

Knute Johnson

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#29127

On 07/15/2014 01:22 PM, Knute Johnson wrote:
> I like these scale factors even better
>
>              float[] factor = new float[] { 1.35f,1f,.7f };

"Digital Black and White Conversion | Photoshop"
<http://landscapephoto.us/Articles/DigitalBlackAndWhite.html>
especially "For Further Reading" and beyond.
Seems that the toning process is the easy part.

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