#----------------------------------------------------------------------
# Simple image transform program
# Un-comment the section that you want to test
#
# Copyright (C) February 23, 2018 -- Dr. William T. Verts
#----------------------------------------------------------------------

Filename = pickAFile()
Canvas = makePicture(Filename)
show(Canvas)

for Y in range(getHeight(Canvas)):
    for X in range(getWidth(Canvas)):
        PX = getPixel(Canvas,X,Y)
        R = getRed(PX)
        G = getGreen(PX)
        B = getBlue(PX)
        
        # Brighten the image
        #R = R + 20
        #G = G + 20
        #B = B + 20
        
        # Darken the image
        #R = R - 20
        #G = G - 20
        #B = B - 20

        # Negate the image
        #R = 255 - R
        #G = 255 - G
        #B = 255 - B
        
        # Gray-Scale the image
        #Average = (R + G + B) / 3
        #R = Average
        #G = Average
        #B = Average
        
        # Change the image to B&W                
        #Average = (R + G + B) / 3
        #if Average > 128:    # Change the number to set the threshold between B and W
        #    R = 255
        #    G = 255
        #    B = 255
        #else:
        #    R = 0
        #    G = 0
        #    B = 0
        
        setRed(PX,R)
        setGreen(PX,G)
        setBlue(PX,B)
    repaint(Canvas)