For posterity, this is fixed in 2.14.1.

On Saturday, 12 June 2021 at 21:34:25 UTC+2 jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:

> In working on a document with tiff images in it, I ran into some trouble. 
> Basically the proportions of the tiff get changed in the output docx file. 
> (Caveat: I don't have Word on my computer, but the macOS quicklook, Pages, 
> LibreOffice, Google doc conversation, and some random on-line file 
> converter all show the problem, so I take it that it's real.) I attach one 
> of the problematic docx files.
>
> It showed up for me like this:
>
> An included tiff image had the wrong proportions in the output docx. The 
> width was scaled down, so the image looked horizontally squished. I attach 
> a screen shot where the first image is a jpeg version and the second a 
> tiff. In that image, the jpeg has the dimensions of 1050x476, for a ratio 
> of 2.20, which matches the original. The tiff is 750x500 for a ratio of 
> 1.50 and the pixel height isn't the same as the jpeg either, so that's 
> getting changed, too.
>
> If I look at the document.xml in the unzipped version of the 
> pandoc-generated docx, I see this, which provides a 1.5 ratio of cx to cy:
>
> ```
> <a:xfrm>
>     <a:off x="0" y="0"/>
>     <a:ext cx="3810000" cy="2540000"/>
> </a:xfrm>
> ```
>
> If I use image magic's format command, the original tiff has the following 
> relevant (I think) properties:
>
> -  Geometry: 1758x798+0+0
> -  Resolution: 300x300
> -  Print size: 5.86x2.66
> -  Units: PixelsPerInch
>
> I don't see anything else that gets me to that 1.5 ratio. Note that both 
> image files in the unzipped docx seem identical to the originals, so 
> nothing is going on there.
>
> 2. In doing some testing, I came across a similar problem. I used 
> imagemagick to create two identical images, one jpeg and the other tiff. 
> Then I put them into a docx via pandoc:
>
> ```
> > magick rose: -format jpeg -resize 600% -colorspace gray -units 
> pixelsperinch -density 300 rose.jpeg
> > magick rose: -format tiff -resize 600% -colorspace gray -units 
> pixelsperinch -density 300 rose.tiff
> > pandoc -t docx -o rose.docx
> Hello.
>
> ![jpeg](./rose.jpeg)
>
> Goodbye
>
> ![tiff](rose.tiff)
>
> ```
> In this case the output images are very obviously differently sized, and 
> the second once again has an aspect ratio of 1.5 (the original is 1.52, so 
> the two images look identically proportioned to the eye). It also has the 
> identical pixel size as the tiff in the other example. I attach this file.
>
> If I output to odt, I get the following warning and the output file again 
> has a wrongly ratio'd tiff (not shown, but it's square):
>
> `[WARNING] Could not determine image size for rose.tiff: could not 
> determine image type`
>
> So something appears to be going on with reading tiffs.
>
> [image: Screen Shot 2021-06-12 at 14.33.55.png]
> [image: Screen Shot 2021-06-12 at 14.44.57.png]
>

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