mirror of
https://github.com/TheAlgorithms/Python.git
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7f04e5cd34
* spelling corrections * review * improved documentation, removed redundant variables, added testing * added type hint * camel case to snake case * spelling fix * review * python --> Python # it is a brand name, not a snake * explicit cast to int * spaces in int list * "!= None" to "is not None" * Update comb_sort.py * various spelling corrections in documentation & several variables naming conventions fix * + char in file name * import dependency - bug fix Co-authored-by: John Law <johnlaw.po@gmail.com>
36 lines
838 B
Python
36 lines
838 B
Python
"""
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Changing contrast with PIL
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This algorithm is used in
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https://noivce.pythonanywhere.com/ Python web app.
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python/black: True
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flake8 : True
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"""
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from PIL import Image
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def change_contrast(img: Image, level: float) -> Image:
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"""
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Function to change contrast
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"""
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factor = (259 * (level + 255)) / (255 * (259 - level))
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def contrast(c: int) -> float:
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"""
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Fundamental Transformation/Operation that'll be performed on
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every bit.
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"""
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return 128 + factor * (c - 128)
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return img.point(contrast)
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if __name__ == "__main__":
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# Load image
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with Image.open("image_data/lena.jpg") as img:
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# Change contrast to 170
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cont_img = change_contrast(img, 170)
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cont_img.save("image_data/lena_high_contrast.png", format="png")
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