Re: GM loses transparency on some grayscale PNG images?

On Wed, 18 Sep 2019, Shane Bishop wrote:

> Hi,
> I was checking the WordPress Photon changelog and stumbled across this
> tidbit:
> https://code.trac.wordpress.org/changeset/488
>
> We use a fork of their API in one of our products, and so I was curious to
> find out more, and see if perhaps the bug had been reported to GM, but
> couldn't find anything online about it (and they've removed the 2 linked
> issues).
> Any idea what this is about? Is it a known issue, or was it fixed at some
> point recently?

I am not aware of any fixes.  The author and maintainer of the PNG 
module (Glenn Randers-Pehrson) died in October of 2018 after a long 
illness.  Contribution to the project is at an all-time low and it 
seems that many people are interested in searching for bugs, and 
reporting bugs, but not so interested in investigating the bugs and 
submitting fixes for them.

I have made many fixes to the PNG module, but mostly to address 
security issues discovered by oss-fuzz or independent security 
researchers.

If a bug report is opened at SourceForge and a problematic PNG is 
attached (carefully wrapped in a zip file because SourceForge 
re-writes uploaded PNGs!) then I may be able to look at it as time 
permits.  The fix may be trivial once the problem is identified.

This project is entirely developed and maintained by unpaid volunteers 
who give of their spare time outside of their normal working hours. 
In the past year, that has almost entirely been me.  Assistance from 
new volunteers would be greatly appreciated.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt