[Qgis-developer] Unable to invoke fileVectorFilters() // Adding jpeg to mapcanvas?

[Tim Sutton]

Hi

You need ideally to have a .wld file accompanying your jpg file. In  
general .jpg is not in my opinion a good format to use for gis  
because a) its lossy and b) the decompression overhead removes much  
of the benifit of the smaller file size. Some changes were made to  
qgis svn a month or two back to allow non georeferenced images to at  
least display at coords 0,0. Can you try to open the file in QGIS and  
see what happens. Best choice is to create a .wld file to accompany  
it with the registration data needed for your jpg to appear in the  
right place. Im attaching a wld file from one of my datasets  as an  
example.

Regards

Tim


On 07/10/2006, at 20:33, Schalk Snyman wrote:

> Hello Tim,
>
> First, thanks again for a great tutorial! (Tutorial 4: Adding a raster
> to the map canvas) These tutorials are really insightful to newbies  
> like
> me who learn best by example.
>
> The caveat is in the same place though:
> I used the exact code from Tutorial 4 (with the adaptions to .pro  
> file)
> with my jpeg file as raster. The program runs without clear errors but
> no image is displayed on map.
>
> i.e. only changed
>   QFileInfo myRasterFileInfo("data/final2.jpg");
>
> This error is still present:
> empty extent... not rendering
>
> Does this mean I do not have jpg compiled with gdal? I've recompiled
> QGIS and everything seemed fine.
>
> Best Regards
> Schalk

-- 
Tim Sutton

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