Re: [gdal-dev] Mosaicking Orthos - Solved

[Zoltan Szecsei]

On 2011-02-21 08:53, Zoltan Szecsei wrote: Hi Marius, Thanks for the response. See below: On 2011-02-20 21:16, Marius Jigmond wrote: Are you sure that the white you see is a pure 255/255/255? Albeit, the nearblack with its near default of 15 would have likely taken care of that. except that when I run nearblack (v1.7.3), it doesn't create the output tiff file. nearblack -white -o 0394w.tif 0394.tif ERROR 4: Creation of file 0394w.tif failed. Ooops! - would help if I set write permissions to the target directory :-/ If you load two othophotos in QGIS and specify the transparent pixels, does the collar between the orthophotos disappear? when I manually add to the Transparent Pixel List, then it works (in Qgis), so how can I update all the ortho images to reflect their nodata values? (meaning, using nearblack should/would work, but my nearblack crashes) Having successfully run 'nearblack -white', gdalbuildvrt worked as expected, with the following parameters:  gdalbuildvrt -addalpha -hidenodata  -srcnodata "255 255 255" -vrtnodata "255 255 255"     job177_untiled_orthos_setnodata.vrt      *.tif Thanks for your help & patience. Kind regards, Zoltan -- =========================================== Zoltan Szecsei PrGISc [PGP0031] Geograph (Pty) Ltd. P.O. Box 7, Muizenberg 7950, South Africa. 65 Main Road, Muizenberg 7945 Western Cape, South Africa. 34° 6'16.35"S 18°28'5.62"E Tel: +27-21-7884897 Mobile: +27-83-6004028 Fax: +27-86-6115323 www.geograph.co.za =========================================== No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1204 / Virus Database: 1435/3456 - Release Date: 02/20/11

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