Film Craft: Editing, Image and Sound

A film is made of gestures you can learn to name. Editing decides the order and duration of shots, the image decides what light and focus reveal, and sound decides what we hear and what we do not. Once you can point at those three layers, a scene stops being a blur and becomes a set of decisions you can describe out loud.

What are the technical gestures of editing?

Editing is the business of choosing shots and putting them in an order. The most familiar gesture is the eyeline match: a character looks off screen, and the next shot shows what they see. The cut works because the direction of the gaze in shot one and the position of the object in shot two agree. Break that agreement and the viewer feels a jump, even without knowing why.

Rhythm is the second gesture. Shot length sets pace. A sequence of two second shots reads as urgency; the same action in eight second shots reads as weight. Duration also carries meaning inside a single shot: hold on a face after the line has ended and the pause becomes the subject.

Order is the third. Two shots of the same event, reversed, tell different stories. A glass falling and then a hand pulling back is an accident; the hand first and the glass second is a decision. Editors call this the Kuleshov effect, after the Soviet filmmaker Lev Kuleshov, whose experiments in the 1910s and 1920s showed that meaning sits between shots rather than inside them. The same neutral face, cut against a bowl of soup or a coffin, was read by audiences as hunger or grief.

For viewers who want to name these moves in French, the film craft notes collect short pieces on cutting, light and sound, written for people who watch rather than shoot.

What do light, colour and focus actually do?

The image layer is where a scene is given its mood before anyone speaks. Direction of light is the first decision. Light from the front flattens a face; light from the side carves it; light from below unsettles it. A cinematographer chooses a direction, then a contrast ratio, which is the difference in brightness between the lit side and the shadow side. A low ratio reads as soft and open, a high ratio as hard and secretive.

Colour is the second decision. It can be motivated by the scene, a lamp, a window, a fire, or imposed by a filter or a grade. Warm and cool tones in the same frame usually signal a division: inside and outside, past and present, one character and another.

Depth of field is the third. A shallow depth of field keeps one plane sharp and blurs the rest, which tells the viewer where to look. A deep depth of field keeps foreground and background both readable, which lets the viewer choose. Neither is better; each is a statement about who is in control of attention.

How does sound shape a scene?

Sound is the layer viewers notice least and miss most. The first distinction is diegetic and non diegetic: a diegetic sound has a source inside the story, a door, a radio, footsteps; a non diegetic sound, usually score, has no source the characters can hear. A radio playing in a kitchen is diegetic. The same music rising over the shot is not.

Space is the second gesture. A room with hard walls and no soft furnishing returns an echo; a carpeted room swallows it. Recordists and mixers build that space with reverb and with the balance between close and distant microphones. When a scene moves from a corridor to a bedroom, the change in the sound of the room often does more work than the cut.

Voice and silence are the third. A line delivered close to the microphone feels interior; the same line recorded at a distance feels public. Silence is not the absence of sound but a choice to remove it, and it reads as pressure when the rest of the scene has been loud.

Common mistakes to avoid

The usual error is treating the three layers separately. A cut that seems wrong is often a sound problem, and a scene that feels flat is often a lighting problem rather than a writing one. The second error is naming a technique without saying what it does in that specific scene: shallow focus is not automatically beautiful, and a fast cut is not automatically tense. The third is ignoring duration. Many viewers describe a shot by its content and forget its length, though length is where rhythm lives. The fourth is assuming the score carries the emotion. In plenty of strong scenes the emotion is carried by a room tone, a breath or a pause, and the music only confirms what the image already said.

How do you analyse a scene in practice?

Pick a scene of two or three minutes and watch it three times. On the first pass, watch only for cuts: mark where they fall and how long each shot lasts. On the second, watch only the image: where is the light coming from, what colour dominates, what is sharp and what is soft. On the third, listen only: what has a source in the scene, what does not, where does the room change, where does the sound drop out.

Then write four or five lines. Name the gesture, say what it does, and quote the moment. A useful checklist:

• The cut: eyeline match, match on action, or a deliberate break
• The light: direction, contrast, and whether the source is visible
• The colour: motivated by the scene or imposed by a grade
• The focus: shallow or deep, and who controls attention
• The sound: diegetic or not, and where the space changes
• The silence: what was removed, and for how long

That is the whole method. The gestures are finite, the vocabulary is small, and the reward is that a scene you have watched for years suddenly shows its seams. The next film you see, you will catch the cut before it lands, notice the lamp just outside the frame, and hear the room go quiet before the line arrives.