Enhancement: Color-related and static-related augmentation

[DonaldTsang]

Here are some features I would like to see in Augmentor

• [ ] Brightening/Dimming of images (based on HSL/HSV vs YUV/YIQ/YCbCr vs RGB)
  • [ ] complete brightening/dimming of the whole picture
  • [ ] gradient brightening/dimming on certain concentrated, horizontal or vertical regions
• [ ] Increase or Decrease of contrast (based on HSL/HSV)
• [ ] Color wheel or Hue rotation (based on HSL/HSV vs YUV/YIQ/YCbCr)
  • [ ] simple rotation H = (H + X) % 360 (or equivalent on YUV/YIQ/YCbCr)
    • X < 360
  • [ ] rotation and color compression H = (Y * H + X) % 360 (or equivalent on YUV/YIQ/YCbCr)
    • Y < 1, X < 360
• [ ] Image static noise (see https://github.com/codebox/image_augmentor#noise)
• [ ] Blurring (see https://github.com/codebox/image_augmentor#blur)