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Index › Programming Questions & Help › Syntax Questions › problems with pixels
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problems with pixels (Read 317 times)
luther_blissett
problems with pixels
Jun 28th, 2006, 8:58am  
Hi there!

Having an issue with changing the pixel value - i'm trying to randomly map a change of pixels from one image to another.
I've managed to get it work once - but can't seem to make it an iterative process.  Any ideas?

PImage myImage;
PImage secondIMG;
int prec;

void setup() {
 size(400, 400);
 myImage = loadImage("atest.jpg");
 secondIMG = loadImage("btest.jpg");
 int prec = 1;
}  

void draw() {
 background(255);
 loadPixels();
 println(prec);
 for(int i=0; i<(200*200); i++) {
   if(int(random(200))<prec) {
     secondIMG.pixels[i] = myImage.pixels[i];
   }
 }
 if (prec>300) {
   prec=1;
 }
 prec++;
 updatePixels();
 image(secondIMG, 0 ,0, 200, 200);
}
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eskimoblood
Re: problems with pixels
Reply #1 - Jun 28th, 2006, 9:17am  
You have do update the pixelsArray of your image. If you call updatePixels() you update the pixels of your screen, but to update image pixelsarray you must call secondIMG.updatePixels(). And you dont need do call the loadPixels add the begin of the draw function.
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Andreas Köberle {eskimoblood}
222550793  
luther_blissett
Re: problems with pixels
Reply #2 - Jun 29th, 2006, 2:34am  
of course - I knew it was something simple!

Thanks eskimoblood!
Cheesy
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