On 10/21/2021 6:34 PM, Pablo Rodriguez via ntg-context wrote:

Dear list,

I have the following imposition sample:

\startbuffer[newbuff] \showframe\showgrid \setuppapersize[A3, landscape] \setuplayout[width=middle] \starttext \dorecurse{4}{\null\page} \stoptext \stopbuffer \startmode[*first] \savebuffer[newbuff][A3page.tex, prefix=no] \executesystemcommand{context --purgeall A3page.tex} \stopmode \showframe \setuplayout[page] \setuppapersize[A5][A4, landscape] \setuparranging [2UP] \setupinteractionscreen[option={landscape, paper}] \starttext \doiffile{A3page.pdf} {\def\Doc{A3page.pdf} \getfiguredimensions[\Doc] \dorecurse{\noffigurepages} {\ifodd\recurselevel \rotate[rotation=90] {\externalfigure[\Doc][page=\recurselevel, width=\textheight]} \else\rotate[rotation=270] {\externalfigure[\Doc][page=\recurselevel, width=\textheight]} \fi}} \stoptext

I’m afraid that if rotation values are 270 or 180, the imposed page has an extra vertical space before. nicer demo:

\showframe \starttext \topskip4cm \dostepwiserecurse{0}{360}{10}{ \ruledhbox{\rotate[rotation=#1]{\blackrule[width=\textheight,height=\textwidth,depth=0cm,color=darkred]}} } \dostepwiserecurse{0}{360}{10}{ \ruledhbox{\rotate[rotation=#1,location=high]{\blackrule[width=\textheight,height=\textwidth,depth=0cm,color=darkgreen]}} } \dostepwiserecurse{0}{360}{10}{ \ruledhbox{\rotate[rotation=#1,location=fit]{\blackrule[width=\textheight,height=\textwidth,depth=0cm,color=darkblue]}} } \dostepwiserecurse{0}{360}{10}{ \ruledhbox{\rotate[rotation=#1,location=middle]{\blackrule[width=\textheight,height=\textwidth,depth=0cm,color=darkcyan]}} } \dostepwiserecurse{0}{360}{10}{ \ruledhbox{\rotate[rotation=#1,location=depth]{\blackrule[width=\textheight,height=\textwidth,depth=0cm,color=darkmagenta]}} } \dostepwiserecurse{0}{360}{10}{ \ruledhbox{\rotate[rotation=#1,location=broad]{\blackrule[width=\textheight,height=\textwidth,depth=0cm,color=darkyellow]}} } \stoptext ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------