https://bugs.documentfoundation.org/show_bug.cgi?id=93136

V Stuart Foote <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEEDINFO
                 CC|                            |[email protected]
          Component|Draw                        |filters and storage
     Ever confirmed|0                           |1

--- Comment #2 from V Stuart Foote <[email protected]> ---

> It took me hours to find out that the reason was that the tiff file had an
> alpha channel. Removing the alpha channel from the image makes it possible
> to import it.

Great thanks for reporting, and digging out what looks to be root cause. 

> Solution should be to change the error message appearing to something
> meaningful, like: “Tiff images with an alpha channel are not supported.” −
> or make it possible to open them, perhaps by internally converting them to
> PNG. PNG files with alpha channels seem to work.

Well, maybe. But it should be obvious that no Dev will concern themselves with
an issue on EOL build. And the 4.3.7.2 release is EOL and nothing will be done
with that code base.  

If you'd like to move this forward, and your suggested enhancement of a warning
message is reasonable, please take a moment and load the current Fresh release
5.0.0, or even a current development master. And retest with your set of
tiff's--Alpha channel or not.  

Reporting against one of these builds is more likely to elicit some interest
from a developer. 

Work was done at the 4.2 release on Alpha channel support in PNG, I don't
believe similar work has ever been done for support of Alpha channel on TIFF
rasters. 

In fact handling of TIFF actually took a hit between 4.1 and 4.2 releases with
adoption of GraphicPrimative2D
(http://cgit.freedesktop.org/libreoffice/core/commit/?id=2e5167528f7566dd9b000e50fc1610b7bf99132a)

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