''' Provides gamma factor corrections
'''

from PIL import Image

def correction( i, gf ) :
    ''' returns the gamma correction for gamma factor gf for value intensity i
    '''

    pass

def pixel( p, gf ) :
    ''' returns a new pixel whose RGB values are gamma corrections for gamma
        factor gf of the RGB values of pixel p
    '''
    pass

def create( original, gf ) :
    ''' Returns a new image whose dimensions match that of original, where a
        pixel in the new image is a gamma correction for gamma factor gf of
        the corresponding pixel in original
    '''

    ow, oh = original.size
    nw, nh = ow, oh
    new_image = Image.new( 'RGB', ( nw, nh ) )

    for nx in range( 0, nw ) :
        for ny in range( 0, nh ) :
            nspot = (nx, ny )
            ospot = nspot
            opixel = original.getpixel( ospot )

            npixel = ...

            new_image.putpixel( nspot, npixel )
    return new_image



if ( __name__ == '__main__' ) :
    import url
    import gamma

    link = 'http://www.cs.virginia.edu/~cs1112/images/mandrill/full.png'

    original = url.get_image( link )

    im = gamma.create( original, 0.25 )
    im.show()
    
    im = gamma.create( original, 2.00 )
    im.show()
    im.show()