mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
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
"""
|
|
Changing contrast with PIL
|
|
|
|
This algorithm is used in
|
|
https://noivce.pythonanywhere.com/ Python web app.
|
|
|
|
python/black: True
|
|
flake8 : True
|
|
"""
|
|
|
|
from PIL import Image
|
|
|
|
|
|
def change_contrast(img: Image, level: float) -> Image:
|
|
"""
|
|
Function to change contrast
|
|
"""
|
|
factor = (259 * (level + 255)) / (255 * (259 - level))
|
|
|
|
def contrast(c: int) -> float:
|
|
"""
|
|
Fundamental Transformation/Operation that'll be performed on
|
|
every bit.
|
|
"""
|
|
return 128 + factor * (c - 128)
|
|
|
|
return img.point(contrast)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
# Load image
|
|
with Image.open("image_data/lena.jpg") as img:
|
|
# Change contrast to 170
|
|
cont_img = change_contrast(img, 170)
|
|
cont_img.save("image_data/lena_high_contrast.png", format="png")
|