get the size of image returns 0

[Viktoras Didziulis]

Image "myIm" is displayed on a card from a ppm file. Answer the size of
image "myIm" always returns zero (Windows XP, Rev Studio 2.6.1 -2.7.5)... 
And when I alternatively try: answer the size of the imagedata of image 
myIm" studio hangs and stops responding. Is it a known bug or whatever else
? I am just trying to measure how much memory in bytes the loaded image
takes...
 
BW 
Viktoras