Graphics on indexed image

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Refering to this, it can be solved by creating a blank bitmap with the same dimensions and the correct PixelFormat and the draw on that bitmap.

// The original bitmap with the wrong pixel format. 
// You can check the pixel format with originalBmp.PixelFormat
Bitmap originalBmp = (Bitmap)Image.FromFile("YourFileName.gif");

// Create a blank bitmap with the same dimensions
Bitmap tempBitmap = new Bitmap(originalBmp.Width, originalBmp.Height);

// From this bitmap, the graphics can be obtained, because it has the right PixelFormat
using(Graphics g = Graphics.FromImage(tempBitmap))
{
    // Draw the original bitmap onto the graphics of the new bitmap
    g.DrawImage(originalBmp, 0, 0);
    // Use g to do whatever you like
    g.DrawLine(...);
}

// Use tempBitmap as you would have used originalBmp embedded in it
return tempBitmap;

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