In this mode you can grab video frames. The video from your local video window is paused
and higher-resolution video is displayed in the slide window
(up to 640x480 depending on your video input hardware). If the slide window is bigger than the
maximum video image, the image is centered in the slide window. If the slide window is smaller
than the maximum video image, the video is cropped to the upper left corner.
Press the 
Grab Now button
to capture the current video frame.
Press the 
Cancel button
to go back to the main window without making a new slide.
The 
Options Popup Menu lets you change the color
of the window in video grab mode.