public static Bitmap DrawOutlineFromLaplacian(Bitmap bmp, Color oldColor, Color penColor)
{
Bitmap outputBM = new Bitmap(bmp.Width, bmp.Height);
var lockedOutputBitmap = new LockedBitmap(outputBM);
lockedOutputBitmap.LockBits();
var lockedOrigBitmap = new LockedBitmap(bmp);
lockedOrigBitmap.LockBits();
Graphics g = Graphics.FromImage(outputBM);
for (int y = 0; y < lockedOrigBitmap.Height; y++)
{
for (int x = 0; x < lockedOrigBitmap.Width; x++)
{
for (int c = 255; c > 100; c--)
{
if (lockedOrigBitmap.GetPixel(x, y) == Color.FromArgb(c, c, c))
{
lockedOutputBitmap.SetPixel(x, y, penColor);
}
}
}
}
lockedOrigBitmap.UnlockBits();
lockedOutputBitmap.UnlockBits();
return(outputBM);
}
// replace one color with another
public static void ReplaceColor(Bitmap bmp, Color oldColor, Color newColor)
{
var lockedBitmap = new LockedBitmap(bmp);
lockedBitmap.LockBits();
for (int y = 0; y < lockedBitmap.Height; y++)
{
for (int x = 0; x < lockedBitmap.Width; x++)
{
if (lockedBitmap.GetPixel(x, y) == oldColor)
{
lockedBitmap.SetPixel(x, y, newColor);
}
}
}
lockedBitmap.UnlockBits();
}
