Design captions that help readers see more

Start with what the viewer could point to in the picture. Suppose the image shows a brick shopfront with a shallow arch over the middle entrance. The caption can say that the bricks fan outward from the top corners of the doorway. A reader now has both a feature and a position. They can look for it without a diagram or another sentence telling them which part of the photograph matters.

Take care with a position word such as left. It is enough to write “the left doorway in the photograph” when you mean the side seen by the reader. If the same photo will appear in a gallery with several related pictures, identify the building or the view as well. Repeated doors and windows make it easy for a caption to drift from one image to the next.

For the first draft, write down three things the photograph shows. Perhaps the arch springs from pale blocks, a course of dark brick sits above it, and a sign now partly covers its top. The picture may support all three observations, but your caption needs only one lead. Choose the detail that helps the reader see what the accompanying article is discussing.

Information such as an address, photographer credit or dated alteration comes from outside the image. Put it after the visual clue when it adds something readers need. For example, if a building survey identifies the entrance as a later addition, attribute that statement to the survey. The photograph can show a change in material. The survey supplies the historical interpretation.

An ink stamp on the back of a print may date a processing job, a library acquisition or a later filing decision. Before giving a year in the caption, find out what the evidence actually dates. Keep a separate note if the shutter date is approximate or unknown. A caption saying the photograph was taken “around 1930” is more informative when an adjacent note explains how the estimate was made.

Try the caption with the whole façade and a tighter view of the arch. In the wider picture, the middle entrance is a useful visual landmark. In the detail, the centre of the image may lie elsewhere and the viewer may see only one corner. Replace any position words that became inaccurate. If the tight crop removed the very clue the caption promises, show a wider image or choose a genuinely visible clue.

The image can look clear in an editing window and lose fine details at phone size. View the finished page at the smallest width your readers are likely to use. Zooming into the file helps establish what the source contains, while the published size tells you what the reader can reasonably see. If the subject is a partly visible mark, consider giving it a separate detail photograph with its own caption.

Save the caption beside a stable image identifier, its credit and any source you consulted. When the page is edited later, compare the caption with the exact file being displayed. End with one practical check. Ask a reader to look at the photo, read the caption and point to the feature it names. If they look at a different part of the image, revise the position cue first. That small change can repair more than an extra paragraph of description.

As a final copy edit, read the caption immediately after the headline. If both name the same feature, let the caption supply the location, shape or relationship that makes the headline more concrete. Check names and image credits once more after final placement.