Bug 408005

Summary: gwenview does not open (all) GeoTIFFs
Product: [Applications] gwenview Reporter: Marcos Dione <mdione>
Component: generalAssignee: Gwenview Bugs <gwenview-bugs-null>
Status: RESOLVED FIXED    
Severity: normal CC: nate
Priority: NOR    
Version First Reported In: 18.04.0   
Target Milestone: ---   
Platform: Debian unstable   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Even GIMP has trouble with it
gwenview error
qgis full
qgis 1:1

Description Marcos Dione 2019-05-27 17:54:59 UTC 
SUMMARY
When openeng certain (most, but not all) GeoTIFF files, gwenview presents this 
message:

Loading ‘000x004-hillshade.tif’ failed
Loading meta information failed.

On the console I see this:

QImageReader::read() using format hint "tif" failed: "Unknown error"
QImageReader::read() without format hint failed: "Unsupported image format"
QImageReader::read() using format hint "tif" failed: "Unknown error"
QImageReader::read() without format hint failed: "Unsupported image format"
QImageReader::read() using format hint "tif" failed: "Unknown error"
QImageReader::read() without format hint failed: "Unsupported image format"

I used ldd and strace to guess that libtiff is being used, but libtiff does definitely support GeoTIFF, as it is used by gdal, whi can read and write such files (and gdal's author, Even Rouault, also commits to libtiff (yes, it's all circunstancial, but I think it makes sense).

I would provide a example file, but it weights 9MiB+, and I'm not sure I should attach it or not. Let me know if it's OK.

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.54.0
Qt Version: 5.11.3
Comment 1 Nate Graham 2019-05-28 15:03:57 UTC 
9 MB is above the attachment size limit anyway, but feel free to post a link to a location where it can be found.
Comment 2 Marcos Dione 2019-05-28 19:51:33 UTC 
Try here:

http://dionecanali.hd.free.fr/~mdione/000x004-hillshade.tif
Comment 3 Nate Graham 2019-06-14 04:48:48 UTC 
Created attachment 120856 [details]
Even GIMP has trouble with it

Thanks very much! I notice that even GIMP has trouble with that image. It opens the file, but displays the content as a big blank gray rectangle (see attachment).

It seems like there may be something malformed with these files in question. I would reccommand filing a bug with the authors of the software used to create it. Thanks!
Comment 4 Nate Graham 2019-06-14 04:49:44 UTC 
...Unless, it's supposed to be a big gray rectangle. Can you share a screenshot of what it's supposed to look like.
Comment 5 Marcos Dione 2019-06-14 19:22:55 UTC 
(In reply to Nate Graham from comment #4)
> ...Unless, it's supposed to be a big gray rectangle. Can you share a
> screenshot of what it's supposed to look like.

The file is fine, it's a proper GeoTIFF (altho a very boring one, I should have used a better example).

I added three attachments:

* gwenview failing to open the file.
* qgis with the whole file shown (yes, a grey square).
* qgis showing the file at 1:1 scale.
Comment 6 Marcos Dione 2019-06-14 19:24:19 UTC 
Created attachment 120872 [details]
gwenview error
Comment 7 Marcos Dione 2019-06-14 19:25:05 UTC 
Created attachment 120873 [details]
qgis full
Comment 8 Marcos Dione 2019-06-14 19:25:23 UTC 
Created attachment 120874 [details]
qgis 1:1
Comment 9 Nate Graham 2019-06-14 20:38:35 UTC 
Thanks!
Comment 10 Marcos Dione 2020-11-09 14:28:32 UTC 
I just installed phototonic, which seems to also be qt based, it it can't read those files the same way. Maybe we should push this below the tiff handling stack? Also, bump!
Comment 11 Marcos Dione 2021-07-01 06:52:53 UTC 
I just tried on a big folder full of GeoTiffs and it worked... except that it was OOM'ed because it ate the whole memory :) But that's something for another ticket. 

In my opinion you can close this one.
Comment 12 Nate Graham 2021-07-01 12:01:18 UTC 
Cool, thanks!