Where are lines to update product image ( to add image scale)

[Eric DE MAULDE]

Hi,

In order to implement an image scale function from detail image,
I'm searching the product image update lines :
into "applications/product/script/org/ofbiz/product/product/ProductServices.xml"   method -name= "updateProduct"
or
"applications/product/webapp/catalog/WEB-INF/actions/product/EditProductContent.groovy"

Where is the best file to add an image scale service/function ?
(into "controller.xml" before to call uri="updateProductContent")

Thanks

Eric