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Created attachment 1544483 [details]
test image

Description of problem:
Converting an image to fax results in a blank page. Should be related to #1633602, since it used to work before the changes discussed in that bug report.

Version-Release number of selected component (if applicable):
ImageMagick-6.7.8.9-16.el7_6.x86_64

How reproducible:
Always

Steps to Reproduce:
1. download the attached image
2. convert the image using convert -compress Fax 83902442-88f7-4251-8318-8b77d9fa954b.jpg output_image.tiff
3. open output_image.tiff

Actual results:
the converted image is a white page

Expected results:
a non-white page

Additional info:
using ImageMagick version 6.7.8.9-15.el7_6.x86_64 works correctly.
Judging from the rpm spec the culprit may be the patch discussed in #1633602

any news on this one?

For now we have downgraded the packaged and everything works fine, but also dropping the patch rhbz1633602-quantize.patch works too.

Thanks for the report, there's a simple reproducer and we can fix this.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2312