1. Draw over the edge of a flower with a thick gray highlight. The green circle will follow the cursor and act as a marker tip.
    (The cursor mode must be set to "Draw Hilight" and the display mode must be set to "Image Hilighting").
    Important: The hilight does not need to be precise but it does need to contain the edge of the flower. Try to draw the highlight so that the edge of the object runs approximately at the middle of the highlight trace.

2. If you need to change what you have just done, click on Draw Hilight and select Erase from the menu. The green circle will turn into an eraser.
3. The outline must be closed on either itself or the image border. You may draw hilights around multiple objects.

More about Hilight Drawing*

     Erase all markings from the current frame
     Change marker tip size. Do not try to make it too small, though!
    Cursor mode menu.
    Acts like the <Shift> key in vanilla drawing software. When set on every mouse click is connected with a line segment.

Display mode menu. All Draw, Erase and Mark operations can be done in Image Hilighting or Hilight Map modes only. The display mode also determines which image is sent to the result buffer.

Create a matte

1. Click on Draw Hilight and choose Mark In/Outside from the menu.
2.  Click on the image anywhere outside the outline. This outside area will then turn dark.

3. Click Create Matte button. The display will switch to Outlined Image, showing the outline of the object superimposed on the original image.