public static unsafe Bitmap RemoveColor(Bitmap bitmap,Color c) { using (var bmp = bitmap) { var data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppPArgb); var white = Color.White.ToArgb(); var black = Color.FromArgb(c.R, c.G, c.B).ToArgb(); try { var length = (int*)data.Scan0 + bmp.Height * bmp.Width; for (var p = (int*)data.Scan0; p < length; p++) if (*p > black) *p = white; bmp.UnlockBits(data); return new Bitmap(bmp); } finally { bmp.UnlockBits(data);; } } }
var
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