What's an efficient way to tell if a bitmap is entirely black?

Question

I\'m wondering if there\'s a super-efficient way of confirming that an Image object references an entirely black image, so every pixel within the bitmap is ARGB(255, 0, 0, 0).

Answer 1

Using AForgeNET library (http://www.aforgenet.com) could also be a solution:

public bool IsNotBlackImage()
{
    Assembly assembly = this.GetType().Assembly;
    var imgTest = new Bitmap(assembly.GetManifestResourceStream("TestImage.png"));
    var imgStatistics = new ImageStatistics(imgTest);             
    return imgStatistics.PixelsCountWithoutBlack != 0;
}

For ImageStatistics class reference AForge.Imaging.dll in your project.

http://code.google.com/p/aforge/source/browse/trunk/Sources/Imaging/ImageStatistics.cs