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Topic: ordered dither (Read 1194 times) |
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Koenie
  
 
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ordered dither
« on: Jul 28th, 2004, 10:08pm » |
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I've made this little piece of code that uses an ordered dithering algorithm to make a colored image black and white. Anyway here's the code, it works with every image:
Code:BImage img;
float[] w;
int[] m = {0,32,8,40,2,34,10,42,48,16,56,24,50,18,58,26,12,44,4,36,14,46,6,38,60, 28,52,20,62,30,54,22,3,35,11,43,1,33,9,41,51,19,59,27,49,17,57,25,15,47, 7,39,13,45,5,37,63,31,55,23,61,29,53,21};
int d = (int)sqrt(m.length);
void setup() {
img = loadImage("your_filename_here.ext");
size(img.width, img.height);
w = new float[width*height];
colorMode(RGB,1);
for (int i = 0; i < w.length; i++) w[i] = brightness(img.pixels[i]);
}
void draw() {
for (int i = 0; i < w.length; i++) pixels[i] = (w[i]*d*d > m[i/width%d*d+i%width%d]) ? #FFFFFF : #000000;
} |
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Here is an example to give you an idea of what the program does (the left image is the original image and the right image is the dithered version, I guess that makes sense):
It also works with colored images, because it uses the brightness()-function to get the grayscale version of the pixels.
If anyone is interested in how this code really works, I am willing to explain it.
Koenie
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| « Last Edit: Jul 28th, 2004, 10:11pm by Koenie » |
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http://koeniedesign.com
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