increasing the red color for each pixel in an image

function moreRed(pixel, increaseRedByXpixels){
    var red = pixel.getRed() + increaseRedByXpixels;
    if(red > 255){
        red = 255;
    }
    pixel.setRed(red);
}
var image = new SimpleImage("pixabayhands.jpg");
print(image);
for(var pix of image.values()){
    moreRed(pix, 80);
}
print(image);