TYPO3 Core

I try to combine
<f:image src='file' width="200" alt="preview" />
with
<hga:imgtxt file="{Setup.file}" />

<f:image width="200" height="200" src="{hga:imgtxt(file:'{Setup.file}')}" alt="preview" />

The image has not the right dimension.

<img alt="preview" src="/fileadmin/test.gif" width="1000" height="1000" />

I tried the same code without width and the result was the same as above (1000 instead of 200). So I guess the width is for some reson ignored!