Re: Trim blank space of a PDF page

[Taco Hoekwater <taco@elvenkind.com>]

> On 23 May 2018, at 16:44, Alan Braslau <braslau.list@comcast.net> 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 <j.hagen@xs4all.nl> 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




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