working with PNGs in vb.net

StackOverflow https://stackoverflow.com/questions/2058011

  •  20-09-2019
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Question

I have PNG and need to know if it has an alpha (or if the alpha is completely white)? How can I accomplish this in vb.net code.

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Solution

Use System.Drawing.Image.Flags:

    Dim HasAlpha As Boolean
    Using I = System.Drawing.Image.FromFile("c:\test.png")
        HasAlpha = (I.Flags And System.Drawing.Imaging.ImageFlags.HasAlpha) = System.Drawing.Imaging.ImageFlags.HasAlpha
    End Using
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