[Qgis-user] Raster banding in print composer

[Marco Hugentobler]

Hi Matt

Is the raster image transparent? It is a known issue that there is 
banding with transparent rasters (because the raster is printed in 
several pieces with a small overlap). There is work underway in the 
raster_resampling branch to draw the pieces without overlap (in fact, 
the credits go to Radim here since it is only possible to avoid the 
overlaps after his raster provider redesign).

If the raster is fully opaque, it might be a different issue.

Regards,
Marco

On 11.02.2012 08:26, Matt Conway wrote:
> Hi,
> I'm using a GeoTIFF with a color map, and when I use print composer to 
> export I get banding across the image if I set the quality above 
> 100dpi. Any thoughts?
>
> I'm using QGIS 1.9.90 nightly (updated about 4 hours ago) on Ubuntu 11.10.
>
> Image: http://www.flickr.com/photos/mattwigway/6855286347/
>
> Thanks,
> Matt
>
>
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-- 
Dr. Marco Hugentobler
Sourcepole -  Linux&  Open Source Solutions
Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee

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