@jmu-cs/customscale-camanjs-filter

customscale-camanjs-filter

Grayscale the input image, then map black and white to custom colors.

Example

Caman('#canvas', function () {
    this.revert(false)
    this.customscale()
    this.render()

The custom scale filter accepts four optional arguments (customscale([luminance[, black[, white[, scalingFunction]]]])):

• luminance
  • whether to grayscale the image using "luminance" values (grayscale (r, g, b) == original (r * 0.299, g * 0.587, b * 0.114)) or simple average
  • default: true, so use the "luminance" values
• black
  • the color to which grayscaled black should be mapped
  • default: JMU Purple = #450084
• white
  • the color to which grayscaled white should be mapped
  • default: JMU Gold = #cbb677
• scalingFunction
  • a function that accepts a percentage value (percent of max color value == input/255.0) and returns a new percentage to change the map from grayscale to customscale to a custom curve
  • default: linear (returns percentage without modification)