I have a lot of geotiffs which are quite large at times (meaning they have quite a bit of unnecessary white space between) and I would like to run a batch script to just do a simple compression on them as I believe that they are not compressed because the files that just contain a lot of white space are still unnecessarily huge.
I've been trying for quite a bit (totally new to GDAL) and reading around. But I can't seem to produce any usable results. Most of the time my image turns totally black (when opened in QGIS). I've read that the images just needs to scale up but I'm either getting thrown with 16 bit errors or still produces a black image. I've been trying to piece together some commands via http://www.gdal.org/frmt_gtiff.html and other blogs / discussion forums online but I'm not too sure I'm heading in the right direction. As mentioned... This is all pretty new to me. Just starting looking into GDAL 48 hours ago. Below are the commands that I've tried. I'm using OSGeo4W Shell command line to run this. cd /d e: cd E:\TIFFs_Test gdal_translate GTIFF_RAW:GAPS_2017-02-23.tif test.tif -co PHOTOMETRIC=CMYK -co TFW=YES -co TILED=YES -co BIGTIFF=IF_SAFER -co COMPRESS=JPEG gdal_translate GTIFF_RAW:GAPS_2017-02-23.tif test1.tif -co PHOTOMETRIC=CMYK -co TFW=YES -co TILED=YES -co BIGTIFF=IF_SAFER -co COMPRESS=JPEG -a_srs EPSG:3414 gdal_translate GTIFF_RAW:GAPS_2017-02-23.tif test2.tif -co PHOTOMETRIC=YCBCR -co TFW=YES -co TILED=YES -co BIGTIFF=IF_SAFER -co COMPRESS=JPEG -a_srs EPSG:3414 gdal_translate GTIFF_RAW:GAPS_2017-02-23.tif test4.tif -co PHOTOMETRIC=YCBCR -co TFW=YES -co TILED=YES -co BIGTIFF=IF_SAFER -co COMPRESS=JPEG -ot Int16 -scale 0 255 0 32767 gdal_translate GTIFF_RAW:GAPS_2017-02-23.tif test6.tif -co PHOTOMETRIC=YCBCR -co TFW=YES -co TILED=YES -co BIGTIFF=IF_SAFER -co COMPRESS=JPEG -scale 0 255 0 32767 The image in question is uploaded here. https://www.dropbox.com/s/vol0bflu5avw7xp/TIFFs_Test.rar?dl=0 The file is about 444MB but can be compress via zip to about 81MB. So there is obviously still room for compression. Can anybody point me in the right direction on how to go about this? I would like to eventually run a batch script on a folder to auto compress all the TIFF files. -- Sent from: http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
