<PackageReference Include="System.Drawing.Common" Version="10.0.0-preview.2.25163.9" />

BlackSaturationCurveEffect

Sets the black saturation of an image. The black saturation is the point at which the darkest areas of the image are converted to black.
using Windows.Win32.Graphics.GdiPlus; namespace System.Drawing.Imaging.Effects { public class BlackSaturationCurveEffect : ColorCurveEffect { public int BlackSaturation => base.AdjustValue; public BlackSaturationCurveEffect(CurveChannel channel, int blackSaturation) : base(CurveAdjustments.AdjustBlackSaturation, channel, blackSaturation) { } } }