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Still Pictures and QuickTime Movies > Still Pictures and QuickTime Movies - Pg. 259

The low resolution of the video frame is only half the reason your captured pictures look so bad. Most camcorders capture images the same way television displays images: as hundreds of fne horizontal stripes, or scan lines. You don't actually see all of the scan lines at any one instant; you see odd-numbered lines in one frame, even-num- bered lines in the next. Because the frames fash by your eyes so quickly, your brain smooths the lines together so that you perceive one continuous image. This system of interlacing may work OK for moving video images, but it presents an unpleasant problem when you capture just one frame. Capturing a still image from this footage gives you, in essence, only half of the scan lines that compose the image. iMovie does what it can to fll in the missing information. But as shown in Figure 9-7, there's still a jaggedness problem involving the horizontal scan lines. Exporting a frame Now that your expectations have been duly lowered, here's how you capture a frame in iMovie: Open the project from which you want to grab a still photo. Make sure that no in- dividual clips are selected, and then locate the frame you want to capture. Drag the Playhead along the Scrubber bar, for example. Remember that you can press the left and right arrow keys to step through the movie one frame at a time, or Shift-arrow Creating Still Images from Footage