Re: /CropBox overflows /MediaBox

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

On 2/28/2023 6:23 PM, Pablo Rodriguez via ntg-context wrote:
> Dear list,
> 
> I have the following source:
> 
>    \nopdfcompression
>    \setupinteractionscreen
>      [width=max]
>    \setuplayout
>      [standard]
>      [backspace=.7\textwidth,
>       cutspace=\cutspace,
>       width=middle]
>    \starttext
>    \startmakeup[page]
>    \null
>    \stopmakeup
>    \startmakeup[standard]
>    \null
>    \stopmakeup
>    \stoptext
> 
> Boxes are defined in the following objects:
> 
>    3 0 obj
>    [ 0 0 595.275590072 841.88975789 ]
>    endobj
> 
>    5 0 obj
>    [ 0 0 595.27559 841.889758 ]
>    endobj
> 
>    8 0 obj
>    [ 0 0 968.199847 841.889758 ]
>    endobj
> 
> Page 1 has /MediaBox redirected to object 3 and /CropBox redirected to
> object 5.
> 
> Page 2 has /MediaBox redirected to object 3 and /CropBox redirected to
> object 8.
> 
> I’m not sure whether the oversized /CropBox in the sample above is a
> bug triggered by the use of "\setupinteractionscreen[width=fit]".
> 
>  From the PDF–1.7 specification
> (https://opensource.adobe.com/dc-acrobat-sdk-docs/standards/pdfstandards/pdf/PDF32000_2008.pdf#page=636):
> 
>    The crop, bleed, trim, and art boxes shall not ordinarily extend
>    beyond the boundaries of the media box. If they do, they are
>    effectively reduced to their intersection with the media box.
> 
> https://wiki.contextgarden.net/PDF_Boxes displays an image of (what I
> guess) the ordinary case: /CropBox fits inside /MediaBox.
> 
> Could anyone be so kind to confirm the issue or to explain the
> rationale behind the oversized /CropBox?
different code path (dates from mkiv but i can adapt it for lmtx)

anyway, overflow is in the 7th decimal so quite harmless i guess

Hans


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