Whenever a IMAGE object is created, TSFE holds some additional info about the image, such as height/width.
Here's an example on how to access those properties of TSFE..

lib.imageInfo = COA
lib.imageInfo {
  10 = IMAGE
  	# Remember to change this to an image that exists on yor server
  10.file = fileadmin/templates/images/testpic.jpg
  10.wrap = |<br />
   
  20 = TEXT
  20.data = TSFE:lastImageInfo|0
  20.wrap = Image Width =&nbsp;|<br />
   
  30 = TEXT
  30.data = TSFE:lastImageInfo|1
  30.wrap = Image Height =&nbsp;|<br />
   
  40 = TEXT
  40.data = TSFE:lastImageInfo|2
  40.wrap = Image Type =&nbsp;|<br />
   
  50 = TEXT
  50.data = TSFE:lastImageInfo|3
  50.wrap = Image + Path =&nbsp;|<br />
   
  60 = TEXT
  60.data = TSFE:lastImageInfo|origFile
  60.wrap = Original Image + Path =&nbsp;|<br />
   
  70 = TEXT
  70.data = TSFE:lastImageInfo|origFile_mtime
  70.strftime = %d:%m:%y %H:%M:%S
  70.wrap = Image uploaded at:&nbsp;|<br />
} 

Related snippets:

More fun with TSFE - Getting image information

Fun with TSFE Part 2: Getting additional typolink information

Fun with TSFE Part 3: Getting client information

Fun with TSFE Part 4: Other useful information

This snippet was submitted by Peter Klein

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