Image dialog activates from the View toolbar or by activating Digitizer layout. It provides additional options to background image.
If the ThreadsES detects there is no background image in the drawing, activation of the dialog will offer user to load one.
Background changes the drawing window background color
Show Background toggles background image visibility.
Image Edge Snap allows point snap to any image edge point while drawing objects.
Image Corner Snap allows point snap to image corner points while drawing objects.
Invert Colors inverts the colors in the drawing.
When the background picture is loaded, Show background icon turns red and background image is loaded into preview pane. After the background image is hidden, Show Background icon turns blue and image in the preview pane is crossed out.