In PDF navigation we used to specify produced image resolution.

In other parts of ERP5 we do not specify it. As image resolution
should be handled as a system preference (as other image properties like quality, format, etc..)
do not specify it any more in generated
UI image links. Just let system use provided defaults.

bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/PDF_renderHTMLPreviewAsImage.xml

@@ -43,7 +43,7 @@
                  format python: request.get(\'format\', context.portal_preferences.getPreference(\'preferred_image_format\', \'png\'))">\n
   <img src="" alt=""\n
       tal:attributes="src\n
-        string:${here/absolute_url}/index_html?display=${display}&format=${format}&frame=${frame}&resolution:int=300"/>\n
+        string:${here/absolute_url}/index_html?display=${display}&format=${format}&frame=${frame}"/>\n
 </div>
 
 ]]></unicode> </value>

bt5/erp5_dms/bt/revision

-1255
+1256
\ No newline at end of file