Image well

An image well is the control that shows a picture and is also the place you put the next one. Apple named it in AppKit, where NSImageView becomes an image well the moment it is marked editable, and the name has quietly outlived the framework: the profile-picture box in every settings screen on the web is an image well, built over and over by teams who have no word for it. The defining property is the fusing of two roles. It is the display, so it always shows the current value, and it is the target, so a picture dragged onto it lands.

The contrast with file upload is the whole reason the word is useful. A file input is a button: it says Choose file, it opens the system picker, and the thing you get back is a file name in a field somewhere. An image well never opens anything by itself. You drop onto it, or paste into it, and the picture you see is the value, so there is no gap between what was chosen and what will be saved. Most real controls are both, with the well as the primary target and a small Choose button beside it for people who would rather browse than drag.

What a person expects of it goes past dropping. Because it behaves like a view of an image rather than a form field, the standard editing commands are all supposed to work on it: Command-C copies the picture out, Command-V pastes one in, and Delete or Backspace clears it back to a placeholder. Drag out is expected too, dragging the picture from the well into another app. Teams that wire only the drop half ship something that looks like an image well and answers like a div, which is exactly the kind of half-built control that teaches people not to try.

Two things it is not. An avatar is the round picture as a display element, with no implication that you can change it there; an image well may be drawn as one, but the word names the editability. And a general drag and drop zone is bigger and emptier: it accepts many files, it is usually a dashed rectangle with instructions in it, and it does not show you a value at rest. If the box is showing you the current picture, the word is image well, and a visible drop-target state (the border lighting up as something enters) is the part teams most often forget.