I see now that your files are CCITTFAX4 compressed. I had similar B&W rasters, topographic maps from Belgium, same compression.
I uncompressed all, should boost performance. Plus, I added plenty overviews. Kris -------- Original-Nachricht -------- > Datum: Fri, 29 Apr 2011 14:40:29 +0200 > Von: Patrice Vetsel <[email protected]> > An: Kris Nackaerts <[email protected]> > Betreff: Re: [Qgis-user] Tif too slow to show > I'v done a > gdaladdo -r average 3004221146000AB010200001.tif 2 4 8 16 > > but QGis is always too slow. > > Thanks > > > Le 29 avr. 2011 à 14:21, Kris Nackaerts a écrit : > > > Dear, > > > > I would start trying gdaladdo to create overviews. Does wonders for > speed. > > > > I'm working right now with a global Landsat dataset, vrt, +4000 tiles, > roughly 700k by 300k pixels in total, and even this can be handled > efficiently once you've overviews. > > > > I mainly use uncompressed geotiffs. > > > > Kris > > > > > > -------- Original-Nachricht -------- > >> Datum: Fri, 29 Apr 2011 14:08:00 +0200 > >> Von: Patrice Vetsel <[email protected]> > >> An: [email protected] > >> Betreff: [Qgis-user] Tif too slow to show > > > >> Hi, > >> > >> with an original raster (tif+tfw), from french cadastre, when I open it > >> under qgis, it's unusable because QGis is horribly slow. > >> with the same raster, but after using georef extension (tif+aux.xml), > QGis > >> is responsive > >> > >> here I put gdalinfo of the original (slow) and referenced : > >> > >> What's the problem with the first ? I would prefer to not have to > manually > >> georeference all my original rasters ;) > >> > >> In the same time, what's the most efficient raster type to use with > QGis ? > >> > >> Regards > >> > >> > >> Patrice Vetsel > >> > >> SLOW : > >> MacBook-Pro-de-Patrice-Vetsel:~ Patrice$ > >> /Library/Frameworks/GDAL.framework/Programs/gdalinfo > ~/Desktop/3004221146000AB010200001.tif > >> Driver: GTiff/GeoTIFF > >> Files: /Users/Patrice/Desktop/3004221146000AB010200001.tif > >> /Users/Patrice/Desktop/3004221146000AB010200001.tfw > >> Size is 12329, 8760 > >> Coordinate System is `' > >> GeoTransform = > >> 740551.2494, 0.078, 0.1506 > >> 189669.7013, 0.1506, -0.078 > >> Metadata: > >> TIFFTAG_ARTIST=JBG-PYV-APIC > >> TIFFTAG_XRESOLUTION=300 > >> TIFFTAG_YRESOLUTION=300 > >> TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch) > >> Image Structure Metadata: > >> COMPRESSION=CCITTFAX4 > >> INTERLEAVE=BAND > >> MINISWHITE=YES > >> Corner Coordinates: > >> Upper Left ( 740551.249, 189669.701) > >> Lower Left ( 741870.505, 188986.421) > >> Upper Right ( 741512.911, 191526.449) > >> Lower Right ( 742832.167, 190843.169) > >> Center ( 741691.708, 190256.435) > >> Band 1 Block=12329x1 Type=Byte, ColorInterp=Palette > >> Image Structure Metadata: > >> NBITS=1 > >> Color Table (RGB with 2 entries) > >> 0: 255,255,255,255 > >> 1: 0,0,0,255 > >> > >> > >> OK : > >> MacBook-Pro-de-Patrice-Vetsel:~ Patrice$ > >> /Library/Frameworks/GDAL.framework/Programs/gdalinfo > ~/Desktop/testgeo/AB_georef.tif > >> Driver: GTiff/GeoTIFF > >> Files: /Users/Patrice/Desktop/testgeo/AB_georef.tif > >> /Users/Patrice/Desktop/testgeo/AB_georef.tif.aux.xml > >> Size is 13446, 14968 > >> Coordinate System is `' > >> Origin = (740550.783870017039590,191526.220101331215119) > >> Pixel Size = (0.169699598291267,-0.169699598291267) > >> Image Structure Metadata: > >> INTERLEAVE=BAND > >> Corner Coordinates: > >> Upper Left ( 740550.784, 191526.220) > >> Lower Left ( 740550.784, 188986.157) > >> Upper Right ( 742832.565, 191526.220) > >> Lower Right ( 742832.565, 188986.157) > >> Center ( 741691.674, 190256.188) > >> Band 1 Block=13446x1 Type=Byte, ColorInterp=Palette > >> Color Table (RGB with 256 entries) > >> 0: 255,255,255,255 > >> 1: 0,0,0,255 > >> 2: 0,0,0,255 > >> 3: 0,0,0,255 > >> 4: 0,0,0,255 > >> 5: 0,0,0,255 > >> 6: 0,0,0,255 > >> 7: 0,0,0,255 > >> 8: 0,0,0,255 > >> 9: 0,0,0,255 > >> 10: 0,0,0,255 > >> 11: 0,0,0,255 > >> 12: 0,0,0,255 > >> 13: 0,0,0,255 > >> 14: 0,0,0,255 > >> 15: 0,0,0,255 > >> 16: 0,0,0,255 > >> 17: 0,0,0,255 > >> 18: 0,0,0,255 > >> 19: 0,0,0,255 > >> 20: 0,0,0,255 > >> 21: 0,0,0,255 > >> 22: 0,0,0,255 > >> 23: 0,0,0,255 > >> 24: 0,0,0,255 > >> 25: 0,0,0,255 > >> 26: 0,0,0,255 > >> 27: 0,0,0,255 > >> 28: 0,0,0,255 > >> 29: 0,0,0,255 > >> 30: 0,0,0,255 > >> 31: 0,0,0,255 > >> 32: 0,0,0,255 > >> 33: 0,0,0,255 > >> 34: 0,0,0,255 > >> 35: 0,0,0,255 > >> 36: 0,0,0,255 > >> 37: 0,0,0,255 > >> 38: 0,0,0,255 > >> 39: 0,0,0,255 > >> 40: 0,0,0,255 > >> 41: 0,0,0,255 > >> 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0,0,0,255 > >> 245: 0,0,0,255 > >> 246: 0,0,0,255 > >> 247: 0,0,0,255 > >> 248: 0,0,0,255 > >> 249: 0,0,0,255 > >> 250: 0,0,0,255 > >> 251: 0,0,0,255 > >> 252: 0,0,0,255 > >> 253: 0,0,0,255 > >> 254: 0,0,0,255 > >> 255: 0,0,0,255 > >> > >> > >> _______________________________________________ > >> Qgis-user mailing list > >> [email protected] > >> http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > -- > > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir > > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de > -- NEU: FreePhone - kostenlos mobil telefonieren und surfen! 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