Generally, an 8mm film to DVD transfer will only allow you to watch the DVD or copy the DVD. The video on a DVD is highly compressed. In addition, video on DVD is only 480×720. If you multiple this out, you get 0.34 Megapixels (MP). This means that each frame of video is only 1/3 of a MP. Today’s digital cameras are shooting at 15 to 20 MP per picture. So, 1/3 of one MP is not near enough resolution.
In order to get a decent picture from film you need to transfer the 8mm film to HD video and bring into a video editor. HD video will be 1920×1080 or a frame size of about 1.5 MP. This is about 6 times better quality than a frame from a 8mm film to DVD transfer. You should be able to get decent 4×6 pictures provided the film frame you choose is clear and in focus.
So, if you are looking to print some pictures of your film, have your 8mm film transferred to a HD or 2K (1556 lines) video. Don’t transfer your 8mm film to DVD unless you just want to be able to view it or make copies of it.