/// <summary> /// Calculate image negative using memory (faster process) /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void negativeMemoryToolStripMenuItem_Click(object sender, EventArgs e) { if (img == null) // verify if the image is already opened { return; } Cursor = Cursors.WaitCursor; // clock cursor //copy Undo Image imgUndo = img.Copy(); ImageClass.NegativeMemory(img); ImageViewer.Image = img.Bitmap; ImageViewer.Refresh(); // refresh image on the screen Cursor = Cursors.Default; // normal cursor }