method MagickImage.prototype.privateSigmoidalContrastimport { MagickImage } from "https://deno.land/x/imagemagick_deno@0.0.14/src/magick-image.ts"; privateSigmoidalContrast(sharpen: boolean,contrast: number,midpointOrPercentage?: number | Percentage,channels?: Channels,): voidParameterssharpen: booleancontrast: numberoptionalmidpointOrPercentage: number | Percentageoptionalchannels: ChannelsReturnsvoid