Kooboo maintains a relation map shows the reference and used by relation between objects. You can see exactly where an image is used, either it is in the page html or Css properties. 

Reference

When one object mainly has reference relation to other objects, it will show the reference relation. For example, the page object. 

Open the Page list page, you can see the reference column shows how many views, layouts or other objects a page is using. 

Used by 

Objects like view, style mainly have the used by relation, go to style list page, you will see the used by column

Show relation

Click the icon inside the "Reference" or "Used by" column, open the relation windows. You can see the name of the relation objects, click the name to preview that object, or click the icon on "Edit" column to go to editing page of that object.