method MagickImage.prototype.privateSigmoidalContrastimport { MagickImage } from "https://dotland.deno.dev/x/lume@v1.14.1/deps/imagick.ts"; privateSigmoidalContrast(sharpen: boolean,contrast: number,midpointOrPercentage?: number | Percentage,channels?: Channels,): voidParameterssharpen: booleancontrast: numberoptionalmidpointOrPercentage: number | Percentageoptionalchannels: ChannelsReturnsvoid