Processing

PImage img;

void setup(){
	size(345, 567);
	// The image file must be in the data  folder of the current sketch
	// to load successfully
	img = loadImage("buzz3.jpg"); // Load the image into the program
}

void draw(){
	// display the image at its actual size at point(0,0)
	image(img, 0, 0);
	// Displays the image at point(0, height/2) at half of its size
	// image(img, 0, height/2, img.width/2, img.height/2);
}

openCV
here you can download
http://opencv.org/releases.html
http://opencv.jp/

in python-openCV

import cv2
img = cv2.imread('input.png')
cv2.imwrite('output.png', img)

img = imread('input.png')
imwrite('output.png', img)

imshow(img)
imageinfo('input.png')
help images