You can easily export a still image from your video file using GoPro Studio. Here is a procedure that details the process:

  1. Go to Step 2: Edit
  2. Select the desired video clip so that it is displayed in the Player window.
  3. Mac instructions - Place the playhead so that the frame you want to export is displayed in the player window, then selecting Share > Export Still.
  4. Windows Instructions - Place the playhead so that the frame you want to export is displayed in the player window, then selecting File > Export > Still Image.
  5. Then just select the image Name, Location and Size to Export (small, medium, large, & native) and click Export.
  6. Check out the location you specified to verify that the image was created.