Re: tiff sizing problems in md to docx

["jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <jmuccigr-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Submitted. #7405 <https://github.com/jgm/pandoc/issues/7405>

On Wednesday, 23 June 2021 at 13:27:23 UTC-4 John MacFarlane wrote:

>
> Why don't you submit an issue to the tracker?
> I note that Text.Pandoc.ImageSize doesn't contain a type for
> Tiff, and also that the default for imagesize has a 1.5 aspect
> ratio...so my guess is that we're just using defaults there.
>
> I think it will be a trivial fix to support tiff properly!
>
> "jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > Any help on this one?
> >
> > Thanks.
> >
> > On Saturday, 12 June 2021 at 15:34:25 UTC-4 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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