import sys, math, time
from OpenGL.GLUT import *
from OpenGL.GL import *
from OpenGL.GLU import *
import Image

img = Image.open('image.jpg').transpose(Image.FLIP_TOP_BOTTOM)
imgstring = img.tostring()

def draw():
    glClear(GL_COLOR_BUFFER_BIT)
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
    glPixelTransferf(GL_BLUE_BIAS, math.sin(time.time()))
    glRasterPos2f(-1, -1)
    glDrawPixels(img.size[0], img.size[1], GL_RGB, GL_UNSIGNED_BYTE, imgstring)
    glutSwapBuffers()

def keyboard(key, x, y):
    if key == chr(27):
        sys.exit(0)
    elif key == ' ':
        w = glutGet(GLUT_WINDOW_WIDTH)
        h = glutGet(GLUT_WINDOW_HEIGHT)
        pixdata = glReadPixels(0,0,w,h,GL_RGB,GL_UNSIGNED_BYTE)
        outimg = Image.fromstring('RGB', (w,h), pixdata)
        outimg.transpose(Image.FLIP_TOP_BOTTOM).save('output.jpg')

def idle():
    glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB)
glutInitWindowSize(img.size[0], img.size[1])
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutIdleFunc(idle)
glutMainLoop()