[NTG-context] how to set PDF TrimBox ?

Hans Hagen pragma at wxs.nl
Thu May 21 01:21:23 CEST 2015


On 5/21/2015 12:55 AM, Harald Koenig wrote:
> On May 20, Harald Koenig wrote:
>
>> Hi,
>>
>> how can I set the /TrimBox values in PDF ?
>> right now I use
>>
>>        \setuppapersize[A4][B4]
>
> looking at the current context code I can't (without changing context).
> all boxes are set to identical values:-(
>
> for my current setup I'm using the following hardcoded hack below for now (only for one night;)
>
> what's the reason that the "BleedBox" wasn't output/set ?
>
>
>
> --- tex/texmf-context/tex/context/base/lpdf-mis.lua~	2015-02-10 16:59:48.000000000 +0100
> +++ tex/texmf-context/tex/context/base/lpdf-mis.lua	2015-05-20 22:29:57.044026611 +0200
> @@ -346,9 +346,17 @@
>           boxvalue(width-leftoffset),
>           boxvalue(pageheight-topoffset),
>       }
> +-- 56.6929 79.37005 651.9685 921.25985
> +-- 56.6929 79.3701  651.9685 921.2598
> +    local trimbox = pdfarray { -- can be cached
> +        boxvalue(56.6929 * 65536. * 72.27 / 72.),
> +        boxvalue(79.37005 * 65536. * 72.27 / 72.),
> +        boxvalue(651.9685 * 65536. * 72.27 / 72.),
> +        boxvalue(921.25985 * 65536. * 72.27 / 72.),
> +    }
>       addtopageattributes("CropBox",box) -- mandate for rendering
> -    addtopageattributes("TrimBox",box) -- mandate for pdf/x
> - -- addtopageattributes("BleedBox",box)
> +    addtopageattributes("TrimBox",trimbox) -- mandate for pdf/x
> +    addtopageattributes("BleedBox",box)
>    -- addtopageattributes("ArtBox",box)
>   end

it has to do with pdf standards and validation and so, i need to check it

Hans

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