My experience is

pdfcrop old.pdf new.pdf

should write an automatically cropped version of old.pdf into new.pdf.

JDO
On Apr 12, 2024 at 9:28 PM -0700, list_email--- via Skim-app-users 
<[email protected]>, wrote:
> Thanks, JDO. I had looked at pdfcrop earlier so I gave it another look now. I 
> can’t find an option that automatically removes white space margins. I can 
> give _negative margins_ to get the job done but I have to find these by 
> manual iteration for each image. Workable but a nuisance.
>
> Jerry
>
> > On Mar 18, 2024, at 6:45 AM, John Owens <[email protected]> wrote:
> >
> > I've always used the command-line "pdfcrop" tool for this task (it's in 
> > TeXLive and MiKTeX).
> >
> > "PDFCROP takes a PDF file as input, calculates the BoundingBox for each 
> > page by the help of ghostscript and generates a output PDF file with 
> > removed margins."
> >
> > JDO
> > On Mar 17, 2024 at 11:21 PM -0700, list_email--- via Skim-app-users 
> > <[email protected]>, wrote:
> > > > I am making PDF plots using Plotly which sometimes leaves more white 
> > > > space at the margins than seems necessary, especially when considering 
> > > > cramming them into a column in a paper. Skim does a nice job of 
> > > > cropping, but I’m wondering if there is a way to do this 
> > > > programmatically, e.g,. from Python, Julia, or Ada. I know that Skim is 
> > > > scriptable but I can’t find anything in Skim’s Applescript dictionary 
> > > > about cropping.
> > > >
> > > > I know that if there is an Applescript for doing this on a specified 
> > > > file or all the PDFs in a folder that I can issue the command from any 
> > > > of the other mentioned languages. I would gladly consider a non-Skim 
> > > > way also but I need a method that detects the white-space margins 
> > > > rather than having me manually determine the coordinates of a crop box 
> > > > since they will be different for different images.
> > > >
> > > > Jerry
> > > >
> > > >
> > > >
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> > > > [email protected]
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>
>
>
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