shift.md

degradation {
  type = "shift"
  shift_type= ["cmyk","rgb","yuv"]
  percent = true
  rgb = {
    r = [[-10,10], [-10,10]]
    g = [[-10,10], [-10,10]]
    b = [[-10,10], [-10,10]]
  }
  cmyk = {
    c = [[-10,10], [-10,10]]
    m = [[-10,10], [-10,10]]
    y = [[-10,10], [-10,10]]
    k = [[0,0], [0,0]]
  }
  yuv = {
    y = [[-10,10], [-10,10]]
    u = [[-10,10], [-10,10]]
    v = [[-10,10], [-10,10]]
  }
  not_target = [[-10,10], [-10,10]]
  probability = 0.5
}

* = optional parameters

Basic Parameters

• shift_type* - Color spaces to apply shifts in

  • Default: ["rgb"]
  • Options: "rgb", "yuv", "cmyk"
  • Multiple types can be used
  • Each type creates different artifacts

• percent* - Controls shift measurement

  • Default: false
  • true: Shifts are % of image size
  • false: Shifts are in pixels

• probability* - Chance of applying effect

  • Default: 1.0
  • Range: 0.0 to 1.0

Channel Shift Settings

Each channel has format: [[x_min,x_max], [y_min,y_max]]

• x values control horizontal shift
• y values control vertical shift
• Positive = right/down shift
• Negative = left/up shift

RGB Shifts

• rgb.r* - Red channel shift range
• rgb.g* - Green channel shift range
• rgb.b* - Blue channel shift range Example: [[0,5], [0,5]] means:
  • Random x shift: 0-5 pixels/percent right
  • Random y shift: 0-5 pixels/percent down

YUV Shifts

• yuv.y* - Luminance shift range
• yuv.u* - Blue-difference shift range
• yuv.v* - Red-difference shift range

CMYK Shifts

• cmyk.c* - Cyan shift range
• cmyk.m* - Magenta shift range
• cmyk.y* - Yellow shift range
• cmyk.k* - Black shift range

Examples:

all percent = true