# SigmoidalContrast

### Related Doc: package sigmoidal

#### object SigmoidalContrast

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4. #### def apply(tile: MultibandTile, alpha: Double, beta: Double): MultibandTile

Given a MultibandTile object and the parameters alpha and beta, perform the sigmoidal contrast computation on each band and return the result as a multiband tile.

Given a MultibandTile object and the parameters alpha and beta, perform the sigmoidal contrast computation on each band and return the result as a multiband tile.

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

tile

The input multibandtile

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

The output tile

5. #### def apply(tile: Tile, alpha: Double, beta: Double): Tile

Given a singleband Tile object and the parameters alpha and beta, perform the sigmoidal contrast computation and return the result as a tile.

Given a singleband Tile object and the parameters alpha and beta, perform the sigmoidal contrast computation and return the result as a tile.

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

tile

The input tile

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

The output tile

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