how can find size of image after huffman compression?

hello every one

please i have original image airplane.tiff

i compressed it by huffman coding

and i calculate compression ratio = 5.3

and then do huffman decoding

then

imwrite(original.tiff)

imwrite(compressd.tiff)

from propertes of file original size is 34kb

and compressd size 30kb

its true to say cr=34/30=1.13 ?

what mean every result please?