Piwigo plugin that adds a new webservice. The webservice can be used to get the missing derivatives including given custom derivatives.
The webservie works like pwg.getMissingDerivatives but provides the additional paramter customTypes.
Example
http://piwigo/ws.php?format=json&method=custom_missing_derivatives.getMissingDerivativesCustom&customTypes[]=260x180_1_260x180&customTypes[]=520x360_1_520x360