# Image Occlusion

> Hide-and-reveal regions of an image.

## What & why

**Image Occlusion** is fill-in-the-blank for pictures. You take one image, cover parts
of it, and the learner reveals and names each hidden region. It's the strongest type
for anything you learn by _location_ — where a part sits, not just what it's called.

## When it beats Basic

Reach for it when position is the knowledge: anatomy diagrams, a map's countries or
capitals, the parts of a machine, the sections of a chart. Because the answer is tied
to a spot in the image, it can't lean on surrounding words the way a text cloze can —
the learner really has to know where things are.

One base image can hold several occluded regions, so a single well-chosen diagram
becomes a set of review cards — handy, but keep an eye on how many that produces (the
same "one note, several cards" effect as [Cloze](https://www.deckberry.com/creators/guide/card-types/cloze/)).

**A good fit:** a diagram of the human heart with each chamber and vessel hidden — the
learner reveals and names them one at a time.

Every image still has to be one you're allowed to share, with its source recorded —
see [media & licensing](https://www.deckberry.com/creators/guide/building/media-and-licensing/).

## In the editor

Upload the base image, then **draw the masks** right on it: pick **Box**, **Ellipse**,
or **Polygon** and drag over the area to hide (for a polygon, click each corner and
double-click to close). Give every mask the **label** the learner should recall, and an
optional **hint** shown on reveal.

Choose a **reveal mode**:

- **Hide all, reveal one** — every region is masked and the card asks for one at a time
  (the target is highlighted). Best when the surrounding parts would give the answer
  away.
- **Hide one** — only the target is masked; the rest of the image stays visible. Best
  when context is fair game.

Each region becomes **its own review card**. To ask for several masks together — the
lobes of one structure, say — give them the same **group** and they study as a single
card. When you first study a multi-region image, the siblings are held back to the next
day so you don't see the same picture five times in a row.

## Related

- [Which card type to use when](https://www.deckberry.com/creators/guide/card-types/which-to-use/)
- [Rich Media](https://www.deckberry.com/creators/guide/card-types/rich-media/)
- [Media & licensing](https://www.deckberry.com/creators/guide/building/media-and-licensing/)

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[Read this guide on Deckberry](https://www.deckberry.com/creators/guide/card-types/image-occlusion/)