private void fromLabelsToolStripMenuItem_Click(object sender, EventArgs e) { if (img == null) { return; } //copy Undo Image imgUndo = img.Copy(); OpenFileDialog openMask = new OpenFileDialog(); if (openMask.ShowDialog() == DialogResult.OK) { Image <Gray, byte> mask = new Image <Gray, byte>(openMask.FileName); Image <Gray, int> imgFinal = ImageClass.GetWatershedFromLabels(img, mask); ShowIMG.ShowIMGStatic(img, imgFinal); } }