how to pull object out of background

kitty_viewviie · October 2013

I want to pull object out of the background that mean I want to change background of the image. My image is glass of water with a green background. Could you please tell me how to write code to solve this problem. Thank you.

GoToLoop · October 2013

Generally, PImage objects are stamped in canvas using image().
So if your PImage has a full transparent background color, you'll see the 1 determined by canvas's background() instead.

Now, if your PImage has its own background color, you're gonna need to write a code snippet
to identify and change it to another value! >:)

Take a look at pixels[] reference! \m/

kitty_viewviie · October 2013

I just start use Processing last week . I don't know about this program work much. Could you please give example of code to me. :D

I have more question about this problem. How do I write equation to solve this problem of transparent or semi-transparent matting.

GoToLoop · October 2013

This section is about "Questions about Code". It's supposed that you supply a buggy code for us to find out what's wrong! =:)

kitty_viewviie · October 2013

I am sorry I wrote wrong section :-S

shiffman · October 2013

Take a look at this tutorial which will help you get started.

http://processing.org/tutorials/pixels/

kitty_viewviie · October 2013

Thank you for you help. Could you tell me how do write equation to solve this problem of transparent or semi-transparent matting.

GoToLoop · October 2013

Well, here's my attempt. Be aware that it's not been tested and it's just a snippet.
It means it's supposed to be used by a more complete program written by you. Good luck! :-bd

/** 
 * Reset PImage Color (v1.0)
 * by GoToLoop (2013/Oct)
 * 
 * forum.processing.org/two/discussion/188/
 * how-to-pull-object-out-of-background
 */

static final void resetImageColor(PImage img, color c) {
  img.loadPixels();
  final color[] dots = img.pixels;

  for (int i = dots.length; i-- != 0;)
    if (dots[i] == c)   dots[i] = 0;

  img.updatePixels();
}

kitty_viewviie · October 2013

Thank you very much. I will try to do all my best :D

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