Single frame from a motion sequence — captures one defined moment in the action. Foundation for storyboards and animatic planning.
You know the drill: You're sitting with the director before a complex action sequence, and you need to clarify how the camera will move, where the actors will stand, and which angles will work. That's when you turn to phase pictures — individual frames from a planned or already shot sequence of movement that show you the exact moment. A phase picture isn't just a still frame; it's a snapshot from the flow of time that documents a crucial state. Unlike an arbitrary frame in a film, a phase picture shows a deliberately chosen point in the dynamics.
On set, we use phase pictures for pre-production — especially during storyboarding. The storyboard artist often works with your phase pictures to understand the transitions between shots. If you're planning a camera move that frames a face, then leads through a door and ends in the next room, you need at least three defined phase pictures: starting position, transition moment, ending position. This is more efficient than thinking everything through — the visual reality of a frame says more than a hundred sentences of planning. When creating an animatic — that rough, animated storyboard — phase pictures are your raw material. You cut them together, add sound, play with timing. This way, the producer and director can see if your vision works even before shooting.
Technically, phase pictures are also discussed in the context of animation and VFX. An animator creates keyframes and intermediate phase pictures to check motion sequences. In your field — cinematography — the phase picture is a communication tool. It saves you misunderstandings. When the AD asks, "Where exactly should the camera be?", you show a phase picture instead of explaining. The same applies to virtual scouting: You ask the VFX department if the planned composition works and send three phase pictures with different angles. They immediately see what you need.
The difference from keyframes lies in the intention: A keyframe is a critical point for the technical execution of a movement. A phase picture is compositionally relevant — it shows what the image looks like when it becomes important. Use phase pictures early and often in planning. They cost you little time and prevent expensive surprises on set.