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Index › Programming Questions & Help › Syntax Questions › pixel recognition

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pixel recognition? (Read 643 times)

peta-clair

pixel recognition?
Sep 10^th, 2007, 11:31pm

hi
Warning: I am completely new to processing and have no idea what i am talking about!!!

I somehow need to be able to read a pixel from an image and depending on its tone / black, white / hue be able to produce that pixel as something else (as a cross for example).

I have been reading through the libraries etc for clues and ideas. Does anyone have any ideas where I could find help to work this out.

Sorry my explanation isnt clearer ... just message if you need more defining.

Thanks!!!

extrapixel

Re: pixel recognition?
Reply #1 - Sep 11^th, 2007, 12:32am

hi,

have a look at the learning-section of this website. What you want is looping throuth the pixels-array. here's a start:
http://processing.org/learning/topics/pixelarray.html

http://processing.org/learning/examples/explode.html

you can access the pixel[]-array of every PImage. After creating a PImage, something like this:
Quote:

PImage myImg;
void setup() {
(...)
myImg = loadImage("somepic.jpg");
(...)
}

you can use myImg.pixels[0] to get the color of the first pixel of the image, and myImg.pixels[myImg.width*myImg.height] to get the last pixel.

Quote:

void draw() {
color c = myImage.pixels[23];
fill(c);
// -> everything you draw here will be filled with the color of pixel nr 23 in your image.
}

hope this makes sense...

http://www.extrapixel.ch

peta-clair YaBB Newbies Offline Posts: 16	Re: pixel recognition? Reply #2 - Sep 13^th, 2007, 2:35pm Thanks. That helps in my process a little. Its a research paper so anything I can come up with will hopefully get me a little closer to finishing!

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