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using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
namespace png32to24
{
class Program
{
    static void Main(string[] args)
    {
        if (args.Length < 1 || !File.Exists(args[0])) return;
        Bitmap png, png24;
        try { using (FileStream fs = new FileStream(args[0], FileMode.Open, FileAccess.Read)) { png = (Bitmap)Image.FromStream(fs); } }
        catch { return; }
        if (png == null) return;
        if (Image.GetPixelFormatSize(png.PixelFormat) == 24) return;//24bpp
        png24 = new Bitmap(png.Width, png.Height, PixelFormat.Format24bppRgb);
        Graphics g = Graphics.FromImage(png24);
        g.DrawImage(png, 0, 0, png.Width, png.Height);
        g.Dispose();
        string filename = Path.GetDirectoryName(args[0]) + "\\" +Path.GetFileNameWithoutExtension(args[0]) + "_png24.png";
        png24.Save(filename);
    }
}
}

Welcome to .NET 6.0!
---------------------
SDK Version: 6.0.100

----------------
Installed an ASP.NET Core HTTPS development certificate.
To trust the certificate run 'dotnet dev-certs https --trust' (Windows and macOS only).
Learn about HTTPS: https://aka.ms/dotnet-https
----------------
Write your first app: https://aka.ms/dotnet-hello-world
Find out what's new: https://aka.ms/dotnet-whats-new
Explore documentation: https://aka.ms/dotnet-docs
Report issues and find source on GitHub: https://github.com/dotnet/core
Use 'dotnet --help' to see available commands or visit: https://aka.ms/dotnet-cli
--------------------------------------------------------------------------------------
Package source with Name: nuget.org disabled successfully.
Package source with Name: local added successfully.
/home/JBeA7c/Project/Program.cs(12,9): error CS1069: The type name 'Bitmap' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(13,111): error CS0103: The name 'Image' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(13,104): error CS1069: The type name 'Bitmap' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(16,13): error CS0103: The name 'Image' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(17,21): error CS1069: The type name 'Bitmap' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(17,51): error CS0103: The name 'PixelFormat' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(18,9): error CS1069: The type name 'Graphics' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(18,22): error CS0103: The name 'Graphics' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]



/home/JBeA7c/Project/Program.cs(12,9): error CS1069: The type name 'Bitmap' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(13,111): error CS0103: The name 'Image' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(13,104): error CS1069: The type name 'Bitmap' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(16,13): error CS0103: The name 'Image' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(17,21): error CS1069: The type name 'Bitmap' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(17,51): error CS0103: The name 'PixelFormat' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(18,9): error CS1069: The type name 'Graphics' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [/home/JBeA7c/Project/Project.csproj]
/home/JBeA7c/Project/Program.cs(18,22): error CS0103: The name 'Graphics' does not exist in the current context [/home/JBeA7c/Project/Project.csproj]
    0 Warning(s)
    8 Error(s)

Time Elapsed 00:00:04.66

Standard output is empty