[Flow] fluid: get src of image returned and not whole img html element

[jaco graaff]

In the rendering template of fluid I can iterate through a array of images

<f:for each="{field.image}" as="image" iteration="imageIteration">
            <f:image src="fileadmin/uploads/{image.url}"
            width="1400px" height="900px"
            alt="{image.title}"/>
</f:for>

f: image returns a img html element

<img src="typo3temp/_processed_/csm_test_002_01_fdb794d601.jpg" width="210" 
height="120" alt="" />

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BUT
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I want "unsupported attributes in my img element

EXAMPLE:

<img src="typo3temp/_processed_/csm_test_002_01_fdb794d601.jpg"
         data-thumb="typo3temp/_processed_/csm_test_002_01_fdb794d601_thumb.jpg"
         data-caption="#htmlCaption1"/>

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What should I use instead of

  <f:image

to get the SRC

because <f:image takes care of rendering the image in the specified 
resolution etc...

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thanks