[Qgis-developer] Re: [Qgis-user] QGIS and RGBA Geotiffs

[Tim Sutton]

Hi

We will make sure this is supported in the final 1.0 release - please  
check if its in the bug queue and if not make a note there for us so  
we dont forget about it.

Many thanks

Tim

On 21/09/2006, at 16:24, Harry G. McGavran Jr. wrote:

>
> I have a utility that trims the collars of Geotiffs by translating the
> indexed colormap Geotiff into an RGBA Geotiff with the Collar made
> transparent via the alpha channel in the tiff.
>
> The GIMP and other image viewers honor the alpha channel and the  
> Geotiffs
> made with this utility do in fact have transparent collars.
>
> I'm running QGIS 0.7.4 under Ubuntu Dapper and it very nicely will  
> load
> raster Geotiffs and place them correctly based on the Geotiff  
> coordinates --
> BUT -- the collars on the Geotiffs overlay adjoining maps so the image
> isn't very useful -- AND -- unfortunately, if I do the same thing
> except use the RGBA transparent collar Geotiffs, QGIS doesn't honor  
> the
> alpha channel in the RGBA Geotiff so the collars still overlay the  
> adjacent
> maps.
>
> Other image viewers seem to honor tiff RGBA alpha channels.  Is there
> any hope we will see this in QGIS????
>
> If so, the fact that QGIS overlays raster layers positioned correctly
> based on Geotiff coordinates doesn't help.  If QGIS honored the RGBA
> alpha channel, then one could easily join adjacent Geotiffs with QGIS
> and the transparent collar utility.
>
>
> -- 
>
> Harry G. McGavran, Jr.
>
> E-mail: w5pny at arrl.net
>
>
>
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-- 
Tim Sutton

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