Automatic width and height for TV Image

Hi,
I have TV for submitting images, but I also need to automatic generate image with and height according to image dimension (not resizing)
Now, TV creates:
<img src="foo.jpg" />
I need:

<img src="foo.jpg" width="xx" height="xx"/>

In Evo it is possible with PHx snippet, but I could not find anything for revo.

its easy to convert an evo-phx-modifier to an revo-output-filter-snippet.

Quote from: Bruno17 at Jul 13, 2011, 07:24 AM

its easy to convert an evo-phx-modifier to an revo-output-filter-snippet.

maybe, but not for me...
Can you tell me how?

where can we find this modifier?

whole process
UPDATE: Can you please describe where to find it and how to implement?