r = lambda: random.randint(0,255)

tint = tint or '#{:02X}{:02X}{:02X}'.format(r(), r(), r())

if Image.isStringType(src): # file path?

src = Image.open(src)

if src.mode not in ['RGB', 'RGBA']:

raise TypeError('Unsupported source image mode: {}'.format(src.mode))

src.load()

tr, tg, tb = ImageColor.getrgb(tint)

tl = ImageColor.getcolor(tint, "L") # tint color's overall luminosity

if not tl: tl = 1 # avoid division by zero

tl = float(tl) # compute luminosity preserving tint factors

sr, sg, sb = map(lambda tv: tv/tl, (tr, tg, tb)) # per component adjustments

# create look-up tables to map luminosity to adjusted tint

# (using floating-point math only to compute table)

luts = (map(lambda lr: int(lr*sr + 0.5), range(256)) +

map(lambda lg: int(lg*sg + 0.5), range(256)) +

map(lambda lb: int(lb*sb + 0.5), range(256)))

l = ImageOps.grayscale(src) # 8-bit luminosity version of whole image

if Image.getmodebands(src.mode) < 4:

merge_args = (src.mode, (l, l, l)) # for RGB verion of grayscale

else: # include copy of src image's alpha layer

a = Image.new("L", src.size)

a.putdata(src.getdata(3))

merge_args = (src.mode, (l, l, l, a)) # for RGBA verion of grayscale

luts += range(256) # for 1:1 mapping of copied alpha values