Question about PDF manipulation

[Jules Richardson]

On Fri, 2005-06-03 at 10:13 -0400, Paul Koning wrote:
> >>>>> "der" == der Mouse <mouse at rodents.montreal.qc.ca> writes:
> 
>  >> - Ran identify again on the resulting TIFF file, and the comment's
>  >> now changed to: "Image generated by ESP Ghostscript
>  >> (device=pnmraw)"
> 
>  >> ... so it looks like any TIFF 'metadata' isn't getting preserved.
> 
>  der> Worse, it is probably re-rendering the pixels, so unless it's
>  der> quite careful, it's introduced blur due to mismatches between
>  der> the original's pixel boundaries and the output's pixel
>  der> boundaries. 
> 
> Is that speculation or have you seen something that supports this
> notion?  Given Adobe's background, I would assume your speculation is
> false -- Adobe knows this stuff far better than most of us.

Quick test done here, and it does result in exactly the same pixel data
between souce image and the one that's 'passed' through a PDF file; I
saved both before and after images and pnm and a checksum on them shows
that they match...

cheers

Jules