Contrast

Mix.install([
  {:image, "~> 0.38"},
  {:kino, "~> 0.12"}
])

Prepare image

normal_image = Image.open!("/home/livebook/vix/normal.jpg")

Adjust contrast

[
  normal_image,
  Image.contrast!(normal_image, 0.5),
  Image.contrast!(normal_image, 1.5)
]
|> Kino.Layout.grid(columns: 3)

[
  normal_image,
  Image.apply_tone_curve!(normal_image, shadows: -30, mid_points: 20, highlights: 30),
  Image.local_contrast!(normal_image, window_size: 200)
]
|> Kino.Layout.grid(columns: 3)

Sharpen

[
  normal_image,
  Image.sharpen!(normal_image, sigma: 3.0)
]
|> Kino.Layout.grid(columns: 2)