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Detecting a blank or empty bmp file

Posted on 2006-11-21
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Last Modified: 2008-03-10
I would like to know if there is a way to detect a blank bmp file.

Through various ways found on internet, I am able to convert a image to grayscale as well as invert the images but I would like to know if there is a way to see this bmp consists black and white color in it.

In other words, if I have a empty bmp. I can invert the image to black. So my output now is all black. If I detect all black in bmp and no white that means it is empty since it has only one color. If it were not empty, it would have white somewhere.

How can I detect this colors (in my case, only black or white) in a bmp file programmatically.

I am using C# and this is all about windows application.

Thank you in advance,
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Question by:sovroc81
2 Comments
 
LVL 15

Accepted Solution

by:
ozymandias earned 2000 total points
ID: 17991434
When you say "emtpy" I assume you mean every pixel is of the same color, yes ?

bool IsBlank(Bitmap b){
      Color c = b.GetPixel(0,0);
      for (int x = 0; x < b.Width; x++){
            for (int y = 0; y < b.Height; y++){
                  if (c == b.GetPixel(x,y)){
                        return false;
                  }
            }
      }
      return true;
}
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Author Comment

by:sovroc81
ID: 17991847
That is exactly what  I needed.

Thank you for your help in this.
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