Re: [NTG-context] Trim blank space of a PDF page

23 May 2018

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On 23 May 2018, at 16:44, Alan Braslau  wrote:
Do these tools work vectorally, that is identify the drawing extent
and adjust the boundingbox appropriately, or do they (especially gs)
convert to an image and then crop?
in pdfcrop, gs computes a boundingbox based on (one assumes) its
internal image representation. Then it creates a /CropBox that is
then read by the pdfcrop perl script to create occlusion margins 
for an external image include in a plain tex document.

I assume pdftrimwhite does the same.

That was what you wanted to know, right? Not the nitty gritty of
gs’ internal calculations?

Taco
...
I use MP to read the pdf and then crop, but to a fixed closed path.
The problem here appears to seek an autocrop.
Alan
On Wed, 23 May 2018 12:09:29 +0200
Hans Hagen  wrote:
...
On 5/23/2018 11:25 AM, Taco Hoekwater wrote:
...
...
On 05/23/2018 01:25 AM, Procházka Lukáš Ing. wrote:
...
Hello,
just curious - is threre a way how to crop a page of a PDF via
ConTeXt?
Ideally - to process a single page PDF into another file, with
the one page cropped...
The ‘pdfcrop’ command from TeXLive can do that for you on the
command line. It is based around ghostscript which can
automatically find the crop area, then uses pdftex,luatex,or xetex
to create a new pdf.
It is doable to come up with a solution in ConTeXt if you do not
mind specifying the cropbox manually, but automatic cropping is
probably too hard for ConTeXt itself (and likely would end up
duplicating pdfcrop to some extent).
there is a script
pdftrimwhite.pl
in the distribution
Hans
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Taco Hoekwater
Elvenkind BV