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geotrellis.spark.sigmoidal

RDDSigmoidalContrast

object RDDSigmoidalContrast

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  1. def multiband[K, V](rdd: RDD[(K, V)], alpha: Double, beta: Double)(implicit arg0: (V) ⇒ MultibandTile): RDD[(K, MultibandTile)]

    Given an RDD of MultibandTile objects and parameters alpha and beta, return an RDD of tiles where the sigmoidal contrast operation has been performed on each band of each tile.

    Given an RDD of MultibandTile objects and parameters alpha and beta, return an RDD of tiles where the sigmoidal contrast operation has been performed on each band of each tile.

    The approach used is described here: https://www.imagemagick.org/Usage/color_mods/#sigmoidal

    rdd

    An RDD of input tiles

    alpha

    The center around-which the stretch is performed (given as a fraction)

    beta

    The standard deviation in the computation, used to avoid saturating the upper and lower parts of the gamut

    returns

    An RDD of output tiles

  2. def singleband[K, V](rdd: RDD[(K, V)], alpha: Double, beta: Double)(implicit arg0: (V) ⇒ Tile): RDD[(K, Tile)]

    Given an RDD of Tile objects and parameters alpha and beta, return an RDD of tiles upon-which the sigmoidal contrast operation has been performed.

    Given an RDD of Tile objects and parameters alpha and beta, return an RDD of tiles upon-which the sigmoidal contrast operation has been performed.

    The approach used is described here: https://www.imagemagick.org/Usage/color_mods/#sigmoidal

    rdd

    An RDD of input tiles

    alpha

    The center around-which the stretch is performed (given as a fraction)

    beta

    The standard deviation in the computation, used to avoid saturating the upper and lower parts of the gamut

    returns

    An RDD of output tiles