static void Main(string [] args)
{
IWICImagingFactory factory = new WICImagingFactory();
factory.CreateDecoder(ContainerFormats.Png, Vendors.Microsoft, out IWICBitmapDecoder decoder);
using (Stream inputStream = new FileStream("Test.png", FileMode.Open))
{
decoder.Initialize(inputStream.AsIStream(), WICDecodeOptions.MetadataCacheOnDemand);
decoder.GetFrame(0, out IWICBitmapFrameDecode bitmapFrame);
bitmapFrame.GetSize(out uint width, out uint height);
bitmapFrame.GetResolution(out double dpiX, out double dpiY);
Console.WriteLine($"Width: {width}, Height: {height}, DPI: {dpiX}x{dpiY}");
factory.CreateFormatConverter(out IWICFormatConverter formatConverter);
formatConverter.Initialize(bitmapFrame, PixelFormats.PixelFormat32bppBGRA, WICBitmapDitherType.None, null, 1, WICBitmapPaletteType.Custom);
using (Stream outputStream = new FileStream("Output.png", FileMode.Create))
{
factory.CreateEncoder(ContainerFormats.Png, Vendors.Microsoft, out IWICBitmapEncoder encoder);
encoder.Initialize(outputStream.AsIStream(), WICBitmapEncoderCacheOption.NoCache);
encoder.CreateNewFrame(out IWICBitmapFrameEncode frameEncode, out IPropertyBag2 encoderOptions);
frameEncode.Initialize(encoderOptions);
frameEncode.SetPixelFormat(PixelFormats.PixelFormat32bppBGRA);
frameEncode.SetSize(width, height);
frameEncode.SetResolution(dpiX, dpiY);
WICRect rect = new WICRect(0, 0, ( int )width, ( int )height);
frameEncode.WriteSource(formatConverter, ref rect);
frameEncode.Commit();
encoder.Commit();
}
}
}
