Created attachment 1377148 [details]
example with error
Description of problem:
The behaviour of the -annotate options of convert when using a newline in the text has changed in f27.
Version-Release number of selected component (if applicable):
ImageMagick 6.9.9-27 Q16 x86_64 2017-12-23
ImageMagick 6.9.9-19 Q16 x86_64 2017-10-11
convert -size 30x25 xc:yellow -annotate +1+10 "2016\n0912" 20160912.png
Steps to Reproduce:
1. on a f27 system do: convert -size 30x25 xc:yellow -annotate +1+10 "2016\n0912" 20160912.png
2. do the same command on a f26 system (or windows or macos)
3. compare results
on 1 line 2016 garbled with 0912 in a yellow rectangle
View the result with an image viewer.
in a yellow rectangle, view the result with an image viewer.
I downloaded ImageMagick-184.108.40.206-1.fc27.src.rpm and compiled it on a f26 system which did not show garbled text so the problem is not ImageMagick but something else in fedora 27.
Created attachment 1377149 [details]
I'm afraid I don't have a lot of time right now to hunt down the cause as it is outside of ImageMagick. It could be gcc, glibc, or bash. You're welcome to try and assigning this bug to those packages or working with upstream (ImageMagick) on finding the cause.
Did some testing and the problem seems to be with the urw fonts.
If on a f27 system I downgrade urw fonts by installing urw-fonts-2.4-23.fc26.noarch the new line gets back in my picture results. So changing component of this bug.
Did some more testing:
$ strace convert -size 30x25 xc:yellow -annotate +1+10 "2016\n0912" 20160912.png
I see /usr/share/fonts/urw-base35/NimbusSans-Regular.afm is being used as font on F27. So I downloaded urw-fonts-2.4-23.fc26.src.rpm and in there I found the file n019003l.afm which shows a line "FontName NimbusSanL-Regu". I then copied n019003l.afm to /usr/share/fonts/urw-base35/NimbusSans-Regular.afm after which I get expected results using convert. I did not check other NimbusSans files/fonts so at least the new NimbusSans-Regular.afm shows the error.
As a work around I can use the "-font" options with convert e.g.:
convert -size 30x25 xc:yellow -font NimbusSans-Regular -annotate +1+10 "2016\n0912" 20160912.jpg
renders a correct picture.
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