TYPO3 8 <f:image width and height not working

Question

I'm trying to resize my image but isn't working.

<f:image src="{shoe.imageOne.uid}" width="400c" height="525c" treatIdAsReference="1" alt="{shoe.name}" />

I saw on the documentation and other places and this should work but isn't. The image still uses the original size 600x800.

Any idea?

Thanks