HistogramBrightness

HistogramBrightness.py

from PIL import Image

def boundedPixelValue(color, brightnessFactor):
	scaledValue = float(color * (1 + brightnessFactor))
	if scaledValue < 0:
		return 0
	elif scaledValue > 255:
		return 255

	return int(scaledValue)

im = Image.open("source.jpg")   
out = Image.new('RGB', im.size, 0xffffff)

brightnessFactor = float(input("Enter brightness amount (-1.0 to 1.0: "))

width, height = im.size
for x in range(width):
    for y in range(height):
        r,g,b = im.getpixel((x,y))

        updatedR = boundedPixelValue(r, brightnessFactor)
        updatedG = boundedPixelValue(g, brightnessFactor)
        updatedB = boundedPixelValue(b, brightnessFactor)

        out.putpixel((x,y), (updatedR, updatedG, updatedB))

out.save('brightnessScaled.jpg')