Oops. I forgot to delete two lines in my YAML  file.

error message now reads:

Error producing PDF.
! LaTeX Error: Can be used only in preamble.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
...                                             
                                                 
l.65 \usepackage

Here's YAML file:

---
...
date: December 23, 2020
header-includes:
   - \usepackage{wallpaper}
   - \ThisCenterWallPaper{1}{WGLogo.png}
--

Here's -how I call pandoc in Makefile:
       pandoc \
                --top-level-division=chapter  \
                --variable mainfont="DejaVu Sans" \
                --variable monofont="DejaVu Sans Mono" \
                --variable fontsize=11pt \
                --variable geometry:"top=1in, bottom=2in, left=1in, right=1in" \
                --variable geometry:a4paper \
                --table-of-contents \
                --number-sections \
                -f markdown  $< \
                --pdf-engine=pdflatex \
                -o $@

Thanks again,

LRP





On Thu, Dec 24, 2020, at 12:33 PM, Lloyd R. prentice wrote:
> Thanks. But I get this feedback:
> 
> [WARNING] Could not fetch resource 'WritersglenLogo_Color.png': replacing image with description
> [WARNING] Could not fetch resource 'WritersglenLogo_Color.png': replacing image with description
> Error producing PDF.
> ! Package pdftex.def Error: File `WritersglenLogo\T1\textunderscoreColor.png' n
> ot found: using draft setting.
> 
> See the pdftex.def package documentation for explanation.
> Type  H <return>  for immediate help.
> 
> Here's m YAML declaration:
> ---
> ...
> date: December 23, 2020
> header-includes:
>    - \usepackage{wallpaper}
>    - \ThisCenterWallPaper{1}{WGLogo.png}
> ---
> 
> And here's my source directory:
> 
> -rw-r--r-- 1 lloyd lloyd 25516 Aug  1 00:31 WGLogo.png
> -rw-r--r-- 1 lloyd lloyd   871 Dec 24 12:23 Writersglen.md
> 
> LRP
> 
> On Thu, Dec 24, 2020, at 9:43 AM, gnpan wrote:
>> You could use the wallpaper package (https://ftp.cc.uoc.gr/mirrors/CTAN/macros/latex/contrib/wallpaper/wallpapermanual.pdf).
>> Put the following in your YAML block:
>> header-includes: 
>>   - \usepackage{wallpaper}
>>   - \addtolength{\wpYoffset}{12cm} 
>>   - \ThisCenterWallPaper{1}{logo.png}
>> 
>> Change logo.png to whatever you logo is called (make sure it's in the same folder as your txt file) and adjust the Y offset to a value that gets the logo in the required position. You can also change the scale factor {1}. 
>> On Wednesday, 23 December 2020 at 23:38:58 UTC+2 LRP wrote:
>>> I'd like to center a logo before the title on my PDF title page.
>>> 
>>> I found a recipe on the web using \usepackage{titling} in the metadata, but it failed. Can some kind soul show me how?
>>> 
>>> Many thanks,
>>> 
>>> LRP
>> 

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> 
> 

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