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Re: Sepia tone image filter for Java

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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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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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