Detecting if a PNG image file is a Transparent image?

Question

I am looking for a way to quickly determine if a PNG image has transparent features. That is, whether any portion of the image is translucent or displays the background in a

Answer 1

Well, i still don't understand the question completely, but if you just want to check, whether a given image may use transparency features, you can use this code:

Image img = Image.FromFile ( "...", true );
if ( (img.Flags & 0x2) != 0)
{
}

Though it won't help you to determine whether a given png file actually uses transparent features, it will indicate, that it has color type 4 or 6 (both support transparency) according to png file specification.