Cameras like the Canon 7D are special. The photographer can decide on-the-fly whether to shoot Camera Raw images or HD video. But, what if you need both? Photoshop will allow you to open the 7D’s MOV files in order to extract a single image from the movie.
So, why not use the movie file for both video and stills? There are several reasons:
- Image resolution: A still from a HD video will be 1920 x 1080. A Camera Raw file will be 5184 x 3456. That’s a big difference.
- Image detail: The greater image size will also yield greater detail.
- Compression: MPEG video is a compressed format. You can not get around that. Camera Raw is uncompressed Raw data.
Take a look at the 100% crops of both images side-by-side.
So, always plan on shooting a few Camera Raw stills. Even if you only use them as reference images, it is better to have them than to wish you took them.