Processing code to upload

strtol doesn't seem to be parsing the char array of the 32bit value sent. Not sure if I'm even doing this right :(

2. PImage myImage;
3. color c;
4. 
   
5. void setup(){
6.   size(1200, 760);
7.   myImage = loadImage("background1.png");
8.   image(myImage, 0, 0, myImage.width, myImage.height);
9. }
10. 
    
11. void draw(){
12.   loadPixels();
13.   c = pixels[mouseX + mouseY * myImage.width];
14.   fill(c);
15.   noStroke();
16.   rect(500, 350, 50, 50);
17.   println(c); 
18. }

background1.png is a image that has certain areas transparent. When filling the rect with mouse color it does not work. If I remove transparency entirely it works fine. Can anyone explain how to get pixel color off images that are transparent?