apologies for all the comments.  I am guessing that the 16:9 format is 
useful only if you / one can also change the defaults for the PowerPoint 
font sizes.

on PowerPoint macos, the default 16:9 font size for first-level bullet 
points seems to be Calibri 28pt.  This means the default vanilla 
presentation has 8-9 lines of bullet points.

on pandoc, the output default font-size for first-level bullet points is 
Calibri 32pt.

  - in 4:3, pandoc thus also has about 8-9 lines of bullet points;
  - in 169, the font remains the same 32pt, which now means only 6-7 lines 
of bullet points.

6-7 lines is too few IMHO.  Ergo, 16:9 output should go with slightly 
smaller fonts.  For reference, the powerpoint defaults that I am getting are

- title: 60pt
- subtitle: 24pt
- header title: 44pt, Light
- body points, level 1: 28pt
- body points, level 2: 24pt

regards, /iaw


On Sunday, January 2, 2022 at 2:01:21 PM UTC-8 ivo....-xwz7R8GQi1g@public.gmane.org wrote:

>
> I tried to change the default font size in the default (reference) pptx, 
> but pandoc did not pick this one up.  :-(
>
>
> On Sunday, January 2, 2022 at 1:37:39 PM UTC-8 ivo....-xwz7R8GQi1g@public.gmane.org wrote:
>
>>
>> mille grazie.
>>
>> given that powerpoint itself has moved to 16:9, I think it would probably 
>> be a better default.
>>
>> the template trick is supercool.  I had not realized this.  I will try to 
>> stick a modified version into my .pandoc/templates folder.  Is there a 
>> standard name (like default.pptx) that pandoc picks up?
>>
>>
>> On Saturday, December 18, 2021 at 11:44:45 AM UTC-8 John MacFarlane wrote:
>>
>>>
>>> You can change this by using a reference-doc. 
>>>
>>> pandoc --print-default-data-file reference.pptx > reference.pptx 
>>>
>>> Now open reference.pptx with Powerpoint. 
>>>
>>> Go to Page Setup and change the aspect ratio. 
>>>
>>> Save. 
>>>
>>> Now use 
>>>
>>> pandoc --reference-doc reference.pptx input.md -o output.pptx 
>>>
>>> Maybe we should change the default to 16:9. Comments welcome on 
>>> this. 
>>>
>>

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