You can omit extensions of the image filename. Doc-O-Matic will automatically attempt to locate an image file for the output format on the Image Path. The first file Doc-O-Matic detects that matches the filename is used for the image representation. 

Here is a list of file formats Doc-O-Matic attempts to locate:

Make sure that you have stored your image in the needed formats in your image folders. 

You can add several attributes to your image tag. Depending on the output format images can appear as floating images, as linked images and you can insert an alternate image hint text. Attributes are inserted following the image name and they are separated by commas.