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
The input multibandtile
The center around-which the stretch is performed (given as a fraction)
The standard deviation in the computation, used to avoid saturating the upper and lower parts of the gamut
The output 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
The input tile
The center around-which the stretch is performed (given as a fraction)
The standard deviation in the computation, used to avoid saturating the upper and lower parts of the gamut
The output tile
The cell type on which the transform is to act
The center around-which the stretch is performed (given as a fraction)
The standard deviation in the computation, used to avoid saturating the upper and lower parts of the gamut
The raw intensity value to be mapped-from
The intensity value produced by the sigmoidal contrast transformation
Usage of Approximations.{pow | exp} functions can allow to speed up this function on 10 - 15ms. We can consider these functions usages in case of real performance issues caused by a long sigmoidal contrast.