It can also crop/resize etc etc but I only wanted to get the image dimensions.

In case it’s useful, here’s a severely chopped version of my code:

<cfparam name="URL.imgsrc" default="">

<cfscript>
if (URL.imgsrc is not "") {
    imgObj=CreateObject("component", "tmt_img");
    
    theWidth = imgObj.getDimensions(URL.imgsrc).width;
    theHeight = imgObj.getDimensions(URL.imgsrc).height;
    
    writeOutput("Image width = " & theWidth & "<br />");
    writeOutput("Image height = " & theHeight);
} else {
    writeOutput("Need image path (absolute or local)");
}
</cfscript>

It’s far from ideal but it works.