[Tiki-devel] PNG & TIFF transparency wrecked in Tiki 9.0

[Dan <dan...@ho...>]

It seems that Tiki 9.0 doesn't deal with transparency in PNGs and TIFFs 
anymore.

When a PNG or TIFF containing transparency is newly uploaded in Tiki 
9.0, the image is converted to a representation which ignores the 
transparency and uses white instead.

Areas of gradual transparency (e.g. at the fringes of letter glyphs in 
the image) are dithered.

Images containing transparency which already sit in file galleries 
(uploaded using earlier versions of Tiki like 8.3 or 8.4) are not 
affected and go displayed correctly.

I think such an issue might simply be caused by a change to some command 
line in the Tiki machinery calling a helper programm which convertes images.

The problem is observed in installations of Tiki9.0 with Apache / MySQL 
on Fedora 16.

There's an old bug report that addresses a similar problem:
* http://dev.tiki.org/item3730

Take care
– Dan