change_contrast.py

"""
Changing contrast with PIL

This algorithm is used in
https://noivce.pythonanywhere.com/ Python web app.

psf/black: True
ruff : True
"""

fromPILimportImage


defchange_contrast(img: Image, level: int) ->Image:
"""
 Function to change contrast
 """
factor= (259* (level+255)) / (255* (259-level))

defcontrast(c: int) ->int:
"""
 Fundamental Transformation/Operation that'll be performed on
 every bit.
 """
returnint(128+factor* (c-128))

returnimg.point(contrast)


if__name__=="__main__":
# Load image
withImage.open("image_data/lena.jpg") asimg:
# Change contrast to 170
cont_img=change_contrast(img, 170)
cont_img.save("image_data/lena_high_contrast.png", format="png")