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....@ucla.edu 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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