Image Occlusion
Image occlusion lets you hide labelled parts of an image and recall them during review.
It is useful for diagrams, anatomy, maps, pathways, and anything else where location matters.
Creating an image occlusion flashcard
Section titled “Creating an image occlusion flashcard”The normal workflow is:
- Open
Add flashcard. - Choose
Image occlusion. - Paste an image or drag an image file into the modal.
- Open the image occlusion editor.
- Draw or generate masks.
- Save the card.
LearnKit also supports a dedicated Add image occlusion flashcard to note command.
[!NOTE] The full image occlusion editor is desktop-only.
What the editor can do
Section titled “What the editor can do”The current editor supports:
- rectangle and ellipse masks
- moving and resizing masks
- undo and reset actions
- pan and zoom controls
- image crop and rotation tools
- text annotations
- OCR-powered auto-masking
Auto-masking with OCR
Section titled “Auto-masking with OCR”Auto-Mask looks for text-like regions in the image and creates masks for them.
This is useful for labelled diagrams, but it is still a draft step. You should expect to clean up the result manually.
In practice:
- clear, high-contrast labels work best
- existing masks are kept
- generated masks can be moved, resized, regrouped, or deleted before saving
Save modes
Section titled “Save modes”Image occlusion supports two save modes:
| Mode | What it does |
|---|---|
Solo | Creates one review target at a time so each mask or group is tested separately |
All | Hides all masks together on the same card |
Groups
Section titled “Groups”Each mask can have a group key.
Masks with the same group key behave as one unit. This is useful when several labels belong together and should be hidden or revealed together.
Review behaviour
Section titled “Review behaviour”During review, LearnKit shows the image with occlusion overlays.
After you reveal the answer, the app can either:
- reveal the target group only
- reveal all groups at once
Configure that in Settings -> Flashcards -> Image occlusion -> Reveal mode.
Storage settings
Section titled “Storage settings”Image occlusion files are stored separately from the review setting above.
You can configure these in Settings -> Data & Maintenance -> Attachment storage:
Image occlusion folderDelete orphaned image occlusion images
The default folder is Attachments/Image Occlusion/.
Good use cases
Section titled “Good use cases”- anatomy diagrams
- labelled maps
- flowcharts with named parts
- processes where a visual landmark matters
If the content is mostly text and order matters more than location, Ordered Questions or Multiple Choice Questions are usually a better fit.
Last modified: 30/03/2026