No reason to be sorry

.. As 'Red Green' states, "We are all in this together!" (and you guys do an incredible job).
I do have a follow up question though. I was able to spend some time really looking into sitemaps and I need some advice.
I noticed that Google was reporting errors and discovered in the XML file that the image URL being reported was as follows :
<image:loc>
http://gallery.soft-focus-imagining.com/zp-core/i.php?a=Colorado%20Modeling%20Network/Retro%2070s/Arlet&i=CMN+-+70s+Retro+Shoot-Colorado-139.jpg&s=1000&cw=&ch=&q=95&wmk=!
</image:loc>
The problem is the zp-core/i.php part. Typically you would want \zp-core\ in the robots.txt file as a disallow and this throws google off and reports the image as an error.
URL restricted by robots.txt
Is there a way around this?
Nigel.