Re: [gdal-dev] TIFF overviews issue

2012-12-03 Thread Fabian Schindler
Perfect, your workaround works for me. As I'm mostly dealing with small fairly small images, the performance decrease may not be a concern for me. I'll stick with this solution until I can definitely say that the target system has libtiff 4.0. Thanks Even! On 12/01/2012 11:37 AM, Even Rouaul

Re: [gdal-dev] TIFF overviews issue

2012-12-01 Thread Even Rouault
> I can also reproduce with libtiff 3.9.2. libtiff 3.X suffers sometimes from > some problems when generating overviews in a interleaved way, as it is > done by BuildOverviews("NEAREST", [2,4,8,16]). Those problems have been > corrected in libtiff 4.0 > > A way to workaround this is to generate e

Re: [gdal-dev] TIFF overviews issue

2012-12-01 Thread Even Rouault
Le vendredi 30 novembre 2012 16:21:59, Fabian Schindler a écrit : > Dear devs, > > I'm experiencing an strange issue concerning overviews when I try to add > overviews via Python. Essentially I want to create overviews for > Greyscale images encoded in RGB, but on one overview level I always get >

[gdal-dev] TIFF overviews issue

2012-11-30 Thread Fabian Schindler
Dear devs, I'm experiencing an strange issue concerning overviews when I try to add overviews via Python. Essentially I want to create overviews for Greyscale images encoded in RGB, but on one overview level I always get colored pixels in a specific rectangle area of the image. I created the