Select the brush tool on the left toolbar painting pixels as you see fit to be included or not included in the background to include pixels in the background, paint them black with the brush tool they should appear red and quick math Smoke to remove pixels from the background.
選擇左側工具欄上的畫筆工具,按照你認為合適的方式繪製像素,以包括或不包括在背景中,將像素包括在背景中,用畫筆工具將它們塗成黑色,它們應該顯示為紅色,快速數學煙霧從背景中刪除像素。