Thanks. 

I gave it a shot and gave up after another an hour of trial and error. What 
language do the pandoc templates use? is it syntax that's pandoc-specific 
or a language whose grammar is documented some place or other?

Anyway I have given up on this and as a work-around I put together a shell 
script that:

1. runs pandoc to create the epub
2. unzips the epub
3. runs some standard *nix tools to fix the cover.xhtml file (head, cat, 
sed…) and add "properties=svg" to its <item> reference in the content.opf 
"manifest"
4. zips back the epub
5. runs epubcheck to verify the resulting epub's conformity.

qwick and dirty... not flexible.. works for me…

In any case, since programs that specialize in epub editing/handling such 
as sigil or calibre appear to use this svg wrapper strategy in order to 
ensure that the cover image is scaled to cover the entire display area of 
the e-reader's screen, my feeling about this is that when the 
--epub-cover-image option is used… perhaps pandoc should do likewise and 
generate this type of code *BY DEFAULT*... rather than via a custom 
template...? 

Thanks,

SM

On Wednesday, July 3, 2019 at 12:24:42 PM UTC-4, Sal Migondis wrote:
>
> Is there any way I can customize the generated EPUB/text/cover.xhtml file 
> created by pandoc?
>
> Basically I would need to replace the default:
>
> <div id="cover-image">
>> <img src="../media/cover.png" alt="cover image" />
>> </div>
>>
>>
> By something like this:
>
> <div id="cover-image">
>> <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="
>> http://www.w3.org/1999/xlink" version="1.1" width="100%" height="100%" 
>> viewBox="0 0 900 1200" preserveAspectRatio="none">
>> <image width="900" height="1200" xlink:href="../media/cover.png"/>
>> </svg>
>> </div>
>>
>>
> The idea is to wrap the cover image in an <svg> </svg> tag so that it 
> scales to the dimensions of the e-reader.
>
> Note that 900x1200 just happens to be the dimensions of the default covers 
> I generate on my system.
>
> I am having a problem where my covers are not correctly displayed on the 
> e-reader I use (ancient Kobo glo' with 758x1024 screen). 
>
> Thanks,
>
> SM
>

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