<PackageReference Include="System.Drawing.Common" Version="10.0.0-preview.7.25380.108" />

Windows.Win32.Graphics.GdiPlus.PaletteFlags

namespace Windows.Win32.Graphics.GdiPlus { internal enum PaletteFlags { PaletteFlagsHasAlpha = 1, PaletteFlagsGrayScale = 2, PaletteFlagsHalftone = 4 } }