using System.Drawing
I still cannot use Point or Image in my code..csproj file does have
<PackageReference Include="System.Drawing.Common" Version="4.7.0"/>
I was able to get System.Drawing.Common working in OSX by also adding the runtime.osx.10.10-x64.CoreCompat.System.Drawing NuGet package.
Note that my OSX test platform is Azure Pipelines. You can look over my csproj file if you find it helpful. It contains:
<ItemGroup>
<PackageReference Include="runtime.osx.10.10-x64.CoreCompat.System.Drawing" Version="5.8.64" />
<PackageReference Include="System.Drawing.Common" Version="4.7.0" />
</ItemGroup>
Don't forget to add a using statement to the top of your CS files:
using System.Drawing;