By dragging image documents from the library into a richtext field you can create inline images. The document types that are supported for this operation and the image blob properties that are accessed to display the images can be configured using the registerRichTextEmbeddableType method of the global editorContext object. You can also use the configureDocumentTypes plugin as shown in the BlueprintFormsStudioPlugin of CoreMedia Blueprint:

<editor:ConfigureDocumentTypes
        names="CMPicture,CMImage"
        richTextImageBlobProperty="data"/>
<editor:ConfigureDefaultRichTextImageDocumentType
        defaultRichTextImageType="CMPicture"/>

The previous example also shows how the configureDefaultRichTextImageDocumentType plugin can be used to configure the document type that limits the search when the library is opened using the embedded image button of the richtext toolbar.