Opacity in images in WPF

开发者_如何学编程How can I detect transparent pixels in an image using WPF so that I know where a user clicks?

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U don't need Image class, it is not design for pixel manipulation. Rater use Bitmap* class

BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.UriSource = new Uri(@"/test.png",UriKind.RelativeOrAbsolute);
bi.EndInit();

an exapmle

Implement public PixelColor[,] GetPixels(BitmapSource source) method and then interate through returned array to find Alpha channel ( a simple loop). Mind that some images does not support transparency and the file vary depends on structure (ARGB, RGBA) etc.