UrlRewrite IIS to make existing image urls work with ImageResizer

Question

We are trying to use Imageresizer with the disk cache feature as well as the sqldatareader. It expects urls to be in the form of:

http://somesite.com/image/{imageid}.{extension}

whereas all the image links in our site is currently:

http://somesite.com/image.aspx?imageid={imageid}&format={extension}

The best solution I have found so far to convert these is UrlRewrite but we are kind of doing the opposite of what it intends (taking nice urls to nasty). I have been struggling to get the rewrite rule correct for this and was hoping that somebody could help. Below is what I currently have and am aware it may be completely wrong:

 <rewrite>
     <rules>
         <rule name="RewriteUserFriendlyURL1" stopProcessing="true">
             <match url="^image.aspx?([^imageid=]+)$" ignoreCase="true" />
             <conditions>
                 <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="false" />
                 <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
             </conditions>
             <action type="Rewrite" url="image/{R:1}.jpg" />
         </rule>
     </rules>
  </rewrite>

Answer 1

Was able to get the basic functionality to work with the following rule.

<rule name="Redirect Category Name and Sort By" stopProcessing="true">
    <match url="^image\.aspx$" ignoreCase="true" />
    <conditions logicalGrouping="MatchAll" trackAllCaptures="true">
        <add input="{QUERY_STRING}" pattern="^imageid=([0-9]+)" />
    </conditions>
    <action type="Rewrite" url="image/{C:1}.jpg" appendQueryString="true" />
</rule>