Thank you. Let's see if the Quality Control person is convinced by what 
she gets with the suggested measurements.

I usually set things up 'as if' they would be on A4, in this case, 
\setuppapersize[ACN][A4] (ACN being the name I give to the 140x216mm 
book in question).

And yes, I have looked carefully at the 'Layout' section of 
Contextgarden, but the difficulty always is marrying its terminology 
with what someone wants who deals only with InDesign. And that causes 
confusion (for me, at least). But it certainly helps me to know that 
'/your left margin is backspace/', since I had been presuming that 
'leftmargin' meant left margin!

Maybe, one of these days, someone with experience in both ConTeXt and 
InDesign (since InDesign is used by very many commercial publishers, but 
I am trying to convince one of them of the value of ConTeXt) could offer 
a comparison of the layout terminology/measurements/requirements for 
both. I for one would find that very helpful.

Julian

On 26/8/20 6:33 pm, Henning Hraban Ramm wrote:
>
>> Am 26.08.2020 um 08:44 schrieb jbf <roma83537@gmail.com>:
>>
>> Severe Covid-19 restrictions locally have left me out on a limb unable to be side-byside with people who can set me on track for a few things! Hence the bombardment of questions, for which I apologise. But almost there!
>>
>> The InDesign QC individual (who accepts my ConTeXt-produced pdfs) wants some tweaking to my layout, saying, in simple terms: Odd/right pgs left margin should be 20mm and right margin 15mm; even/left pgs right margin 20mm and left margin 15mm.
>>
>> I think the difficulty is that what InDesign calls margins might be termed a little differently in ConTeXt and I have no experience with InDesign.
>>
>> My initial setup was as follows for a paper size defined as [width=140mm,height=216mm] double-sided setup (in other words a standard 8.5"x5.5" book):
>>
>> \setuplayout
>>
>> [backspace=16mm,
>>      topspace=12mm,
>>      header=6mm,
>>      headerdistance=10mm,
>>      footerdistance=9mm,
>>      footer=8mm,
>>      width=fit,
>>      horoffset=12.7mm,
>>      location=middle,
>>      height=198mm,
>>      marking=on]
>>
>> There was no mention of 'margins' as such in that layout, and the result is close to what is wanted but not quite. Do I solve the problem by adding in: leftmargin=20mm,
>> rightmargin=15mm,
>>
>> or is it some other item I need to adjust to ensure the 20mm/15mm dimensions requested?
> If you don’t need marginals, your left margin is backspace, right margin is: paper width - width - backspace, i.e. for A4:
>
> \setuplayout[
>    backspace=20mm,
>    width=175mm
> ]
> \setuppagenumbering[alternative=doublesided] % mirror right and left pages
>
>
> See also https://wiki.contextgarden.net/Layout
>
> Hraban
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