Different bitmap output based on makeCopy parameter in ToBitmap method

[ankitbko]

public override async void Receive(Message<Shared<Image>> message)
{
    var bmp = message.Data.Resource.ToBitmap(false);
    bmp.Save("img.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

    // ...... removed for brevity
}

When var bmp = message.Data.Resource.ToBitmap(false); I get this image

When I change the Boolean using var bmp = message.Data.Resource.ToBitmap(true); I get this image.

Not sure if this is a bug or not.

[sandrist]

Hmm, I wasn't able to replicate this behavior with a simple test. I saved your second image as "C:\Temp\test-image.png", loaded it as a \psi Image, and called ToBitmap in both ways.

var image = Image.FromBitmap(new Bitmap(@"C:\Temp\test-image.png"));
image.ToBitmap(false).Save(@"C:\Temp\test-image-false.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
image.ToBitmap(true).Save(@"C:\Temp\test-image-true.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

but both resulting images look fine...

There still might be a bug in ToBitmap if something is screwed up with stride or pixel format, but I think I would have to see more of your code showing how the Shared<Image> stream gets created that is being passed to your Receive method.

[ankitbko]

After troubleshooting together, we found out that the incorrect behavior happens in linux only and not in windows (mac is untested). The sample code that @sandrist wrote leads to reproducible behavior in linux machine.