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Basic Use

Glutanimate edited this page Jan 14, 2017 · 11 revisions

Adding Cards

Video Tutorial

You can refer to the following tutorial video for a general overview of the topics covered in this Wiki section:

YouTube: Image Occlusion Enhanced for Anki - Usage

Please understand that some of the points in the video might be out of date. You will always find the most recent information in this Wiki.

Video Errata for Image Occlusion ≥1.0.0

Occlusion modes

  • The nonoverlapping occlusion type is now called Hide All, Reveal One
  • The overlapping occlusion type is now called Hide One, Reveal All
  • A new occlusion type called Hide All, Reveal All is now available. Functionally this one sits between the other two in that it hides all masks on the front, but also reveals all of them on the back.

Changing the image

You can now switch to a different image right from the IO Editor dialog. This won't clear any of your existing masks or field data, and is mostly meant as a quick way of switching to a different version of the same base image.

General Instructions

Work in progress

Editing Cards

Video Tutorial

You can refer to the following tutorial videos for a general overview of the topics covered in this Wiki section:

YouTube: Image Occlusion Enhanced for Anki - Editing

YouTube: Image Occlusion Enhanced for Anki - Advanced Editing

Please understand that some of the points in the videos might be out of date. You will always find the most recent information in this Wiki.

General Instructions

Launching IO in Editing Mode

You can invoke IO's Editing mode by clicking on the IO button in Anki's browser or the editing window. Notes will only be available for editing if they fulfill all of the following criteria:

  • Correct note type, i.e. Image Occlusion Enhanced
  • A valid ID (Hidden) field
  • A valid Original Mask field

Please see here for instructions on how to convert older IO notes into editable notes.

Editing Notes

Screenshot of IO in Editing Mode

General Principle

When editing a single note, your changes will be propagated to all notes that were created alongside the current one when the note generation button was clicked (we call these "sibling notes"). For changes specific to a single card, i.e. a single occluded item, you will have to use Anki's regular editing screens.

Important: Please don't modify any of the following fields when you are in Anki's Browser or Editing window:

  • ID (hidden)
  • Question Mask
  • Answer Mask
  • Original Mask

Modifications to these fields might break your notes and/or make them uneditable.

Warning: Actions performed in Image Occlusion's Editing Mode cannot be easily undone, so please make sure to check your changes twice before applying them.

The only exception to this are purely textual changes to fields like the header or footer of your notes. These can be fully reverted by using Ctrl+Z in the Browser or Reviewer view.

Fields and Tags

This works as you would expect. Any changes to the entry fields will be applied to all sibling notes. If you want to exempt a specific field from being globally editable you can add it to the list of hidden fields in the Options dialog.


Each mask shape represents a card. Changes to the mask will edit the corresponding card in place, preserving its scheduling information. Removing any of the existing shapes will remove the corresponding card. New shapes will generate new cards.

New groups of existing shapes are treated as new shapes, each generating a new card while deleting all cards of the shapes that are now grouped. The same principle, only in reverse, applies to dissolving an existing group.

Editing existing groups in place without affecting their corresponding cards can be best achieved by using the [in-group editing feature](Advanced Use#editing-items-within-a-group).

Occlusion Type

The add-on will use the original occlusion type by default. You can change this by using the drop-down box on the bottom.


Use the Change Image button on the bottom left to change the image. Please make sure that your shapes don't end up outside of the canvas area when switching to a smaller image. Otherwise cards with empty masks will be generated.


The Deck Selector only applies for the Add New Cards button (see below). Please use Anki's Browser for changing the deck, as you would with any other type of note.

Creating New Note Batches

If you click on the Add New Cards button while in Editing Mode a completely new batch of cards will be generated, leaving your originals untouched.

Note Editing, the Media Collection, and Syncing

When editing existing notes, Image Occlusion Enhanced will modify the corresponding mask files in place. Anki's support for detecting modified media files is somewhat limited, so you might run into instances where your changes won't sync straight away. These issues normally resolve themselves as you add new media files to your collection. If they don't, you might have to perform a one-way sync to AnkiWeb.

Another important detail to remember is that AnkiDroid and AnkiMobile cache image files within a session. This means that changes you've synced might not appear until restarting the app.

Performance Considerations

Unlike creating new IO cards, each successive note editing session will increase Anki's memory usage by about 10-15 MB. This has to do with limitations surrounding the image and web cache of the graphical toolkit Anki is built on. Until I have figured out a way to prevent this, you might want to restart Anki every now and then when editing a lot of IO cards.

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