Composition

Photography Fundamentals

Course 1 · Chapter 5 · Composition: Arranging the Frame

Composition

With exposure, lens, focus and light covered in Photography Fundamentals 1 to 4, the remaining question is where to put things in the frame. Composition is that choice. This chapter covers the best-known guideline, the rule of thirds, and a handful of other ideas from Wikipedia's Composition (visual arts) article, with a clear warning that all of them are guidelines, not laws.

The Rule of Thirds

Wikipedia's Rule of thirds article calls it a rule of thumb for composing designs, films, paintings and photographs. The guideline proposes that an image should be imagined as divided into nine equal parts, and key elements are placed along the lines or where they meet. The four intersections are sometimes called "power points" or "crash points".

Placement	Effect (per the article)
Subject on a line or intersection	Avoids centring the subject
Horizon on the top or bottom line	Avoids splitting the frame in half
Moving or non-frontal subject	More open space is typically left in front of it

Where the idea comes from

The article says the term was first written down by John Thomas Smith in 1797 in Remarks on Rural Scenery, building on Joshua Reynolds's 1783 discussion of balancing light and dark. Smith favoured roughly a two-to-one ratio over an exact half.

A rule of thumb, with critics

The article reports that in 1845 George Field argued the rule was neither accurate nor universal and could produce monotonous work. It also cites a 2014 study (Amirshahi and colleagues) finding the rule "seems to play only a minor, if any, role" in large sets of high-quality photographs and paintings. I read these only in the article's summary of them, not the original papers (check).

The article lists the golden ratio only as a "See also" link and does not explain any relationship, so I make no claim about one (check).

Computing the Grid

The script below finds the four power points for an image size and the distance from any point to the nearest one. I ran it and the output is shown. It is my own illustration of the idea, not something from the article.

from math import hypot

def thirds(w, h):
    xs = (w / 3, 2 * w / 3)
    ys = (h / 3, 2 * h / 3)
    return [(x, y) for x in xs for y in ys]

def nearest(point, w, h):
    best = min(thirds(w, h), key=lambda p: hypot(p[0] - point[0], p[1] - point[1]))
    return best, hypot(best[0] - point[0], best[1] - point[1])

W, H = 6000, 4000
print("Power points:", thirds(W, H))
for name, pt in [("centre", (3000, 2000)), ("subject", (2100, 1300)), ("corner", (500, 500))]:
    p, d = nearest(pt, W, H)
    print(f"{name:7} {pt} -> nearest {p[0]:.0f},{p[1]:.0f}, distance {d:.0f} px ({d / hypot(W, H) * 100:.1f}% of diagonal)")

# Output (first line shortened to two decimals)
Power points: [(2000.0, 1333.33), (2000.0, 2666.67), (4000.0, 1333.33), (4000.0, 2666.67)]
centre  (3000, 2000) -> nearest 2000,1333, distance 1202 px (16.7% of diagonal)
subject (2100, 1300) -> nearest 2000,1333, distance 105 px (1.5% of diagonal)
corner  (500, 500) -> nearest 2000,1333, distance 1716 px (23.8% of diagonal)

The first output line is shortened for display: the real line prints full floating-point numbers such as 1333.3333333333333. I renamed one label in the script after the run; the numbers are unchanged.

Reading the result

A dead-centre subject is the same distance (1202 px, 16.7% of the diagonal) from every power point, so no point is "nearest" in any meaningful sense; the script just returns the first one it checks. A subject placed 105 px from a power point is, to the eye, essentially on it. The distance is only a measure of how close you are, not of how good the picture is.

Other Compositional Ideas

From the Composition (visual arts) article, which covers art generally rather than photography only:

Idea	What the article says
Balance	Works are pleasing when elements are "arranged in a balanced compositional way"; not defined further
Contrast	Value contrast creates the illusion of light; small, high-contrast elements can have as much impact as larger, duller ones
Movement	Compositions should encourage the eye to travel around the image rather than settle on one spot
Leading lines	Lines, literal or implied, guide the viewer's eye toward the subject or divide the composition
Symmetry	An option; an even number of subjects can create symmetries that look less natural in informal compositions
Negative space	The empty areas around, above and within a subject; the subject is positive space
Unity	Techniques aim to create a sense of unity within the work

Not covered by the article

I asked the article about emphasis, rhythm, proportion and framing. It does not name rhythm or proportion as principles, does not define framing (beyond a note about a central figure flanked by two others feeling friendly and comforting), and treats emphasis only as a centre of interest, usually off-centre. Photography courses often teach "frame within a frame"; I have not sourced that here (check).

Not Yet Verified, and Sources

Sources. Wikipedia articles Rule of thirds and Composition (visual arts), both read through page summaries only.
Not read directly. The Field (1845) argument and the 2014 study are reported second-hand through the article.
Not sourced. The golden ratio link, the frame-within-a-frame idea, and any claim that thirds improves a photograph (all check).

Exercises

Exercise 1

Change the script to an image 4000 by 3000 pixels. List the four power points and find which one a subject at (1400, 900) is nearest, and how far away it is.

→ Solution

Exercise 2

Take any three of your own photographs. For each, draw the nine-part grid over it (most photo apps and phones can show one) and write down whether the main subject sits on a line, on an intersection or near the centre. Do the pictures that obey the rule look better to you? Give a reason, bearing in mind the critics' view.

→ Solution

Exercise 3

Match each description to one idea from the table: (a) a road that draws the viewer toward a distant point; (b) a large empty sky above a small figure; (c) a mirror-image layout; (d) a bright small object against a dark, large one. Then explain which one the rule of thirds tends to produce on its own.

→ Solution

Quick Reference

Rule of thirds: imagine nine equal parts; use the lines and four intersections
First written: John Thomas Smith, 1797 (per the article)
Caveat: a rule of thumb; critics and a 2014 study say its role is small
Others: balance, contrast, movement, leading lines, symmetry, negative space
Check: golden ratio link, frame within a frame

Coming next

Photography Fundamentals 6 returns to the camera: metering, exposure compensation and shooting modes.