A level horizon

Learning goal

You will be able to explain why a tilted horizon bothers the viewer. When there is no visible horizon or the ground slopes, you will choose which line to straighten by; knowing that a wide-angle lens can bend the horizon at the edges, you will place the horizon in the frame accordingly; you will weigh the cost of straightening a crooked photo with the straighten tool, and you will tell when to use a tilt only knowingly and clearly.

The question

You look at a photo taken on the shore of a lake, at the edge of a field or on the deck of a ferry. The light is good, the subject is clear, the background is clean. But something bothers you inside; you can't say what it is right away. Then you notice: the water rises slightly to one side. It is as if the whole lake is about to flow into one corner of the frame.

Why does a tilted horizon bother the eye? Because all our lives we have known that water lies level and the ground doesn't slide beneath us. When a photo contradicts this knowledge, the eye starts looking not at the photo but at the mistake. In Lesson 4.4 you learned to turn on the grid and align the horizon with a line. In this lesson we will talk about situations where the horizon can't be seen and slopes and shores mislead, the cost of fixing it afterward, and the moments when a tilt becomes a storytelling tool.

Context

Throughout this module you chose the frame, placed your hero, cleaned up the background and decided on the direction of the rectangle. All these decisions assumed that the frame itself was level. A level horizon looks more technical than the module's other decisions, but it is one of the flaws a viewer notices fastest; especially in scenes such as water, the sea and plains, a tilt of a few degrees can upset the balance of the whole photo.

The human body builds its balance according to gravity. The balance organs in the inner ear constantly report which way is down, and the eyes compare large lines that stray from the horizontal with this information. When we look at a photo, our body doesn't tilt, but the world in the photo has tilted. This contradiction creates a slight feeling of sliding, spilling or falling in the person looking at the scene. That is why a level horizon is less an aesthetic preference than a precondition for the viewer to be able to step comfortably into the photo.

Simple explanation

If the horizon can't be seen, what do you straighten by?

At the seaside the horizon is a clear line and lines up easily with the horizontal line of the grid. But in most scenes the real horizon can't be seen: hills, buildings or trees hide it. Then you look for another reference. The most reliable reference is usually vertical lines: the corner of a building, a door frame, an electricity pole or a tree trunk. Because these stand upright according to gravity, their being parallel to the vertical line of the frame shows that the phone is held level.

Sometimes there are false horizons too. A slope, a sloping stretch of shore or a curve in a road are lines that look like the horizon but are really tilted. If you align the line of a slope with the grid, the slope looks level but a house and the trees on that slope lean to the side. Instead of trying to straighten a false horizon, take as your reference a vertical element in the scene or a small piece of the real horizon visible in the distance. The level indicator found in many phones' cameras is useful here too, because it looks not at the scene but at gravity.

Why does a wide-angle lens bend the horizon?

Phones' wide and ultra-wide cameras gather the scene inward like a bow. In these lenses a straight line passing through the middle of the frame stays straight, but as it nears the edges, lines start to bend. This is called lens distortion. If the horizon runs right through the middle of the frame it looks straight; if it runs near the top or bottom edge, it curves slightly, and the sea can look swollen like a ball or hollowed like a bowl.

That is why, when you shoot with the ultra-wide angle and put the horizon on one of the lines from Lesson 6.3, the curve can become noticeable. One solution is to bring the horizon closer to the center. Turning on the distortion correction in the phone's settings or in an editing app also helps. Many phones do this on their own, but not always; checking the horizon after shooting is the most reliable way. The same distortion also stretches faces at the edge of the frame; when photographing people, keeping them away from the edges protects both the horizon and the faces.

What is the cost of fixing it afterward?

Almost every editing app has a straighten tool: it straightens the horizon by rotating the photo a few degrees. But a rotated rectangle leaves gaps at its corners, and the app crops the photo to cut them off. The bigger the tilt, the bigger the crop; elements at the edges are lost and resolution drops. The shoulder or half of a person standing near the edge can be cut off.

This crop also affects skin tone indirectly. Where the horizon runs decides whether the sky, or the sea, a field or a slope, comes behind a face. If a bright sky comes behind a dark-skinned face, the face can darken; raising the horizon a little and bringing the face in front of a dark green slope or the sea keeps the tonal balance. In the other direction, a pale sky can wash out light skin. Building the horizon level and in the right place at the moment of shooting prevents rotating and cropping afterward from upsetting this balance.

When is a tilt used knowingly?

A tilted frame is sometimes a deliberate storytelling tool. A frame of a child caught running, the crowd of a festival or the moment of a fall can look more lively, more restless with a tilted frame. The key point here is that the tilt is clear. A tilt of a few degrees looks like a mistake to the viewer; a clear deliberate tilt is read as a conscious choice. If you are going to use a tilt, do it firmly, not hesitantly, and be in a position to say what it adds to the photo. There is a balance to watch in a tilted frame too: when the tilt matches the energy of the scene, for example the movement of a running child or a spinning dancer, the viewer reads it as an attitude; in a calm, still scene the same tilt looks like a mistake again. Using a tilt now and then within a series in which the rest of the photos are built level also makes it more meaningful; in a series where every frame is tilted, the tilt stops being storytelling and turns into a habit.

Visual evidence

On the Black Sea coast, in a tea garden on a steep slope, there is a woman picking leaves into her basket. First you align the slope with the horizontal line of the grid. The rows of tea stand perfectly level in the frame, but the stone house in the middle of the slope and the electricity pole next to it lean to the left; it is as if the whole world is toppling to one side. The woman's dark face is in front of the white, bright sky behind her; the face has gone dark and its features can't be made out.

Then you turn the phone so that the corner of the stone house and the pole are parallel to the vertical line of the grid. The rows of tea now come down diagonally, with the real slope of the hillside; the house and the pole stand upright. You climb a little higher, to the upper part of the slope, and look down; dark green rows of tea come behind the woman instead of the sky. Her face stands out clearly in front of the green, and her hand reaching for the basket can be made out. The slope is still steep, but this time the slope is the scene itself; the photo isn't crooked, the world is level and the slope is steep.

Common mistakes

Summary

A tilted horizon shifts the viewer's attention from the photo to the mistake, because it contradicts what we know about water and ground lying level. If there is no visible horizon, you need to align with vertical lines or the level indicator, not straighten false horizons, bring the horizon closer to the center with the ultra-wide angle, and fix the tilt at the moment of shooting instead of leaving it to cropping afterward; where the horizon sits also decides which tone comes behind a face, and a tilt becomes a storytelling tool only when it is clear and deliberate.

Mini assignment

The day's project is about the horizon and verticals; the sixth frame of the "30 Photos in 30 Days" series will come from here.

1. Find a sloping place with no visible horizon: a hill, a staircase, a hillside or a ramp.
2. Photograph the scene once aligned with the sloping line and once aligned with a vertical line.
3. With your phone's widest camera, take two frames, once with the horizon near the edge of the frame and once in the middle, and look at whether the horizon bends.
4. Photograph a lively scene with a clear tilt on purpose, and write in a sentence what the tilt adds to the photo.

Check yourself

• In the frame aligned with a vertical line, do the houses, poles or railings stand upright?
• Were you able to notice the horizon near the edge bending at the wide angle?
• Does your tilted frame read like a mistake or like a conscious choice?

Glossary

Mini quiz

1. Why does a tilted horizon create discomfort in the viewer?

• A) Because it fades the colors of the photo
• B) Because it makes the frame smaller
• C) Because it contradicts what we know about water and ground lying level
• D) Because it blurs the subject

2. On a sloping hillside, which line is more reliable to align with?

• A) The line of the slope itself
• B) A vertical line such as the corner of a house or a pole
• C) The line of the rows of tea
• D) The diagonal of the frame

3. What can happen when the horizon is put near the edge while shooting with the ultra-wide angle?

• A) The horizon can curve because of lens distortion
• B) The horizon disappears
• C) The sky turns blue
• D) The photo's resolution increases

4. When a bright sky comes behind a dark-skinned face, what can you do with where the horizon sits?

• A) Lower the horizon and enlarge the sky behind the face
• B) Turn off the flash
• C) Rotate the photo afterward
• D) Climb higher and bring a dark slope or the sea behind the face

Answers

1. C — Our body balances itself according to gravity and knows that water lies level; a tilted world contradicts this knowledge and gives a feeling of sliding.
2. B — The slope is a false horizon; buildings and poles stand upright according to gravity, so they offer a reliable reference.
3. A — A wide-angle lens bends straight lines near the edge; the further the horizon is from the center, the more it curves.
4. D — Where the horizon sits decides the tone that comes behind the face; a dark slope or the sea separates a dark-skinned face better than a bright sky.

Summary card

• A tilted horizon shifts the viewer's eye from the photo to the mistake.
• If the horizon can't be seen, align with verticals or the level indicator.
• Don't straighten the slope; straighten the world, and let the slope stay steep.
• At the wide angle, bring the horizon closer to the center.
• Use a tilt only when it is clear and deliberate.

Bridge to the next lesson

Your frame is now level, your hero is in place, your background is clean. But many photos stay weak despite all these decisions, because the photographer stood too far from the subject. The next lesson talks about why good photos are mostly "close", and why in most weak frames the real problem is distance.