Exporting movies as still images

I have been exporting my videos as GIFs, but I just noticed that the GIFs that are being exported are in far lower quality than the corresponding still images in the app. Does anyone know how I can change the quality of the GIFs to match the quality of the original images? If there is another way of exporting the movies as still images that might work better, I am interested in hearing about that as well. (I need the shots in still images because I am doing extensive photoshop work on each of them. I am aware that I could import the whole video to Final Cut and create a still frame for each frame, but I would certainly hope that there is an easier, more user friendly way of doing this as I am working with around 700 frames.)