Can someone explain how if I paste a 33Mb tiff into Xtreme and save it... it makes a xar of 1.7Mb. If I copy the tiff from Xtreme and paste it into PSP and export as a tiff, it makes a .... yes .... 33Mb file.

Do I lose anything?!!! Looking closely at the images (a scan of a B&W document), the quality looks very close.