[XeTeX] FYI: \includegraphics and *.bb files

[Zdenek Wagner]

I have never used *.bb files. I use regularly png, jpg, pdf in both
pdflatex and xelatex and they just work. If I want to scale an image,
I use width/height/scale parameter in \includegraphics. I am not sure
whether png contains information on resolution. What I know for sure
is that PDF/X (for printing) does not allow RGB and does not allow
transparent images (alpha). If the document was printed, they had to
convert the images to either grayscale or to CMYK (for colour
printing) and remove transparency. It might have changed metadata of
the images.

Zdeněk Wagner
http://ttsm.icpf.cas.cz/team/wagner.shtml
http://icebearsoft.euweb.cz

út 14. 5. 2019 v 23:06 odesílatel Bruno Le Floch <blflatex at gmail.com> napsal:
>
> On 5/14/19 21:15, Janusz S. Bień wrote:
> > On Tue, May 14 2019 at 20:48 +02, Bruno Le Floch wrote:
> >> On 5/14/19 08:50, Janusz S. Bień wrote:
> >>> The paper was accepted and several days ago I prepared a final
> >>> version. To my surprise almost all images was scaled down by
> >>> XeLaTeX. The test shows the culprit is the presence of *.bb files. There
> >>> are however some *.bb files which has no such side effect.
> >>>
> >>> All *.bb files were created by the same version of the same program, I
> >>> don't see any essential difference between them.
> >>
> >> The difference may be in the image files themselves: some images declare
> >> their bounding boxes and others not.  I don't remember details but if
> >> you can state what file-type the images have, this may help.
> >
> > All images are in the PNG format:
> >
> > --8<---------------cut here---------------start------------->8---
> > paginacja_1x.png:   PNG image data, 2871 x 511, 8-bit gray+alpha, non-interlaced
> > paginacja2-3.png:   PNG image data, 352 x 324, 8-bit/color RGBA, non-interlaced
> > paginacja5_4-7.png: PNG image data, 635 x 543, 8-bit gray+alpha, non-interlaced
> > ParkoszIIIF.png:    PNG image data, 1920 x 1200, 8-bit/color RGBA, non-interlaced
> > --8<---------------cut here---------------end--------------->8---
> >
> >
> > Best regards
> >
> > Janusz
> >
>
> https://groups.google.com/forum/#!topic/comp.text.tex/iJcKNH9VgCE
>
> seems to have some related information