Worse, it is
probably re-rendering the pixels, so [...]
Is that speculation or have you seen
something that supports this
notion?
Yes. (It was speculation, but with a basis.)
Specifically,
>> "Image generated by ESP Ghostscript
(device=pnmraw)"
says to me that the extracted image was produced by rendering something
into GhostScript's pnmraw output `device' (and then TIFFifying).
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse at rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B