Question about PDF manipulation

[der Mouse]

>> 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).

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