HI Andrea,

Thanks for your reply. No, actually I am seeding a WMS layer. Quoting form 
first mail:

The WMS request is like this:
https://security.geobasis-bb.de:443/wss/service/WMS-ALKIS/httpauth?SERVICE=WMS&LAYERS=adv_alkis_gebaeude&FORMAT=image%2Fpng&HEIGHT=1134&TRANSPARENT=TRUE&REQUEST=GetMap&WIDTH=1234&BBOX=241422.08804878494,5682813.523432538,242292.88804878492,5683614.323432538&STYLES=&SRS=EPSG:25833&VERSION=1.1.1
(Sorry, the service is password protected as it's an official service and I 
cannot paste it here :-/ but I attached the retrieved image. It's just a plain 
transparent PNG, 1234x1134px with 455 Bytes).

It works all well for seeding the first 3.5 GB of tiles (expecting about 50 GB 
in total), then it seems like a certain "mal-functioning" image is hit and tile 
processing is aborted.

Best, Jens



Von: [email protected] [mailto:[email protected]] Im Auftrag von Andrea 
Aime
Gesendet: Dienstag, 19. November 2013 15:43
An: Nachtigall, Jens (init)
Cc: [email protected]
Betreff: Re: [Geoserver-users] Seeding fails with "Alpha images must have the 
same sample size as the sources"

On Tue, Nov 19, 2013 at 3:32 PM, Nachtigall, Jens (init) 
<[email protected]<mailto:[email protected]>> wrote:
FYI: Just upgraded to GeoServer 2.4.2, but the problem still prevails.

By the looks of it, you're trying to seed a image mosaic layer, right?

One possible cause to the error message could be that the mosaic is made of 
images that
are not uniform from the point of view of the color mode, for example, some 
RGB, some
RGBA.
I don't believe we support this scenario.

Cheers
Andrea

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Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
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