Resize image and Upload

Hello,
Please help me figure this out, my code to upload and resize an image works, but it cannot handle a large 5mega pxl image. It tries to upload the image first and then it resizes it. I need help for this code to first resize the image before it uploads.

<!--- set the full path to the images folder --->
<cfset mediapath = ExpandPath("myimages")>

<!--- set the desired image height ---->
<cfset thumbsize = 75>

<!--- set the desired image width --->
<cfset imagesize = 400>

<cffile action="upload"
filefield="FileUpload"
destination="#MediaPath#"
nameconflict="overwrite">

<!--- read the image ---->
<cfimage name="uploadedImage"
source="#MediaPath#/#file.serverFile#" >

<!--- figure out which way to scale the image --->
<cfif uploadedImage.width gt uploadedImage.height>
<cfset thmb_percentage = (thumbsize / uploadedImage.width)>
<cfset percentage = (imagesize / uploadedImage.width)>
<cfelse>
<cfset thmb_percentage = (thumbsize / uploadedImage.height)>
<cfset percentage = (imagesize / uploadedImage.height)>
</cfif>

<!--- calculate the new thumbnail and image height/width --->
<cfset thumbWidth = round(uploadedImage.width * thmb_percentage)>
<cfset thumbHeight = round(uploadedImage.height * thmb_percentage)>

<cfset newWidth = round(uploadedImage.width * percentage)>
<cfset newHeight = round(uploadedImage.height * percentage)>

<!--- see if we need to resize the image, maybe it is already smaller than our desired size --->
<cfif uploadedImage.width gt imagesize>
<cfimage action="resize"
height="#newHeight#"
width="#newWidth#"
source="#uploadedImage#"
destination="#MediaPath#/#file.serverFile#"
overwrite="true"/>
</cfif>

<!--- end --->

Thanks.