For AI agents: the complete documentation index is available at https://docs.flashnerd.com/llms.txt, the full documentation bundle is available at https://docs.flashnerd.com/llms-full.txt, and this page is available as Markdown at https://docs.flashnerd.com/reference/fields/image-occlusion.md.
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Image Occlusion

Image Occlusion covers selected areas of a picture with rectangular masks. Use it to recall labels in a diagram, parts of a map, or information shown in a table.

It is a Both Only field. The prompt masks the selected regions; revealing the answer shows the underlying image.

Cover the information to recall

  1. Add an Image Occlusion field to your deck template.
  2. Open a card and add an image using the camera, photo library, or file picker.
  3. Use the plus control to add a mask.
  4. Select the mask and drag it over the label or region you want to hide. Resize it with its handles.
  5. Add more masks where needed. Use the duplicate control for another mask of a similar size, or the delete control to remove the selected mask.
  6. Preview both faces and save the card.

The eye control changes mask opacity while editing, making it easier to place masks over the image. Undo reverses an available occlusion edit.

Example

For a labeled plant-cell diagram, cover nucleus and ask yourself to name that structure. A Note field can provide a short explanation after the answer is revealed.

Multiple masks belong to the same card. They do not automatically become separate SRS cards. Create separate cards if you want each region to be scheduled and graded independently.

Image requirements and imported shapes

The same image format and size limits apply as for Image fields: PNG/JPG and up to 10 MiB per image. Use a clear picture with text readable at phone size.

Flashnerd's editable masks are rectangular. When importing compatible Anki image occlusion content, nonrectangular shapes can be adapted to rectangles; inspect the result before studying. See Anki import.