Custom Html-Tag 'image'

Hi,

i'm new to ckeditor and i'm trying to use custom tags with it. Most of my own tags just working fine using:

    CKEDITOR.replace("templateEditor",
    {

        [...]
        allowedContent: true
    });

and

    CKEDITOR.on("instanceReady", function(event)
    {
         CKEDITOR.dtd.placeholder = { name : 1 };
         CKEDITOR.dtd.$empty.placeholder = 1;
         CKEDITOR.dtd.body.placeholder = 1;
         CKEDITOR.dtd.$inline.placeholder = 1;

          [...]

         CKEDITOR.dtd.image = { id : 1 };
         CKEDITOR.dtd.$empty.image = 1;
         CKEDITOR.dtd.body.image = 1;
         CKEDITOR.dtd.$inline.image = 1;
    });

For my own tag 'placeholder' and other this is working fine but unfortunately one of my own custom tags need to be 'image'. This is not an Html 4/5 standard tag but its replaced by CKEditor with the 'img' tag by default.

Since CKEditor is highly adjustable i'm sure there is a way to disable the auto replacement of 'image' tag with the html tag 'img' but i dont know how!

Somebody know how to do this?