text: /*
   * The raster-color-enhancement property specifies image processing filters to
   * be applied to an entire raster layer.
   *
   * The keyword "none" will cause colors to be included directly; with high
   * values encoded as white and low values encoded as black. This is the default
   * behavior.
   * raster-color-enhancement: none;
   *
   * The keyword "normalize" will stretch or compress values so that the minimum
   * value in the raster is mapped to black and the maximum is mapped to white,
   * with intermediate colors mapped linearly along the scale between the two.
   * raster-color-enhancement: normalize;
   *
   * The keyword "histogram" will calculate a color curve such that the output
   * image has roughly the same number of pixels at each brightness.
   */
  * {
    raster-channels: 1;
    raster-color-enhancement: histogram;
  }
  