GIMP will do this, but probably only interactively--GIMP can be run with scripts and, I think, non-interactively, but I've never done it and it might be a bit of work to set up.

On 04/12/17 11:05, Manuel Reiter wrote:
Hi all,

this might be a bit off topic here and if that's against this list's policy, I 
apologize in advance, but I've been websearching literally for hours now 
without finding a solution and I figure somebody here might have had the same 
problem before.

I want to convert a TIFF, scanned at 300 dpi, to a PDF of the same size and dpi. From my searches, this 
should be achievable both with ImageMagick's "convert" with output option "-r300" and 
with ghostscript and "-dPDFSETTINGS=/printer". However, both approaches don't work for me. convert 
resamples the image to 72 dpi while ghostscript correctly embeds the image at full resolution but does 
apparently not set the required metadata for the PDF/embedded image resolution to be recognised as 300 dpi.

Any ideas anybody? Suggestions where else to ask are also highly welcome. 
Thanks in advance!

Cheers,

Manuel

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