I'm doing an online course and I'm confused with a problem that basically needs to:

1. Make a function with pixel position.
2. Obtain the RGB values of the pixel in that position.
3. Change the RGB values of the pixel to make it black.

So far I have this, but I don't understand why I'm still getting the following error:

Error: Line 21 pixel.setRed is not a function. (In 'pixel.setRed(nR)', 'pixel.setRed' is undefined)

This is my code:

// write your code here
function cPixel (image, x,y){
    
    var img = new SimpleImage(image);
    var red = img.getRed(x, y);
    var green = img.getGreen(x, y);
    var blue = img.getBlue(x, y);
    
    
    for (var pixel in img.values()){
        
       if (red && green && blue  > 0) {
            
           pixel.setRed(0);
           pixel.setGreen(0);
           pixel.setBlue(0);
       }
   }
    
   return(img)
    
    
}

Thanks in advance for any help. I've tried to use the forums of the course, but the people there seem to be inactive.