Image size in widget rendering

Is is possible in a display view to set all images size to 'some_size', instead of using tal conditon and render it 'with plain html' ( /@@images/fieldname/scale” ) ? Alternatively, would an alternative be to make a new widget and override the image widget in myview.py ?

Currently, I have a loop that displays fields with:

tal:replace="structure widget/@@ploneform-render-widget"/>

UPDATE: I could change the template, and I notice there is also 'widget['field']. thumb_tag' ( which returns

  <img src="http://10.0.0.159:8090/Plone2/sdfg/@@images/6470e5b6-e254-4412-8578-35ad83d2e50f.jpeg" alt="SDFG" title="SDFG" height="128" width="85" />, 

so maybe that can be generated and replaced