<PackageReference Include="System.Drawing.Common" Version="10.0.0-preview.3.25173.2" />

HighlightCurveEffect

Increases or decreases the value of a color channel if that channel already has a value that is above half intensity.
using Windows.Win32.Graphics.GdiPlus; namespace System.Drawing.Imaging.Effects { public class HighlightCurveEffect : ColorCurveEffect { public int Highlight => base.AdjustValue; public HighlightCurveEffect(CurveChannel channel, int highlight) : base(CurveAdjustments.AdjustHighlight, channel, highlight) { } } }