Lots of customers want to use TIFF files with the File doctype (not the Picture doctype/facet)
nuxeo-document-preview can accommodate TIFFs out of the box through using PDF as an intermediate format.
For example a template in the element (link) can check to see if file:content has the tif mimetype, if so, instead of displaying in pdf viewer using _blob.data as a src it can use the output of
/api/v1/id/{docId}/@convert?format=pdf
Example TIFF file attached.