[QGIS-trac] [Quantum GIS] #1084: ECW takes a long time to display

[Quantum GIS]

#1084: ECW takes a long time to display
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   Reporter:  kyngchaos                         |              Owner:  nobody
       Type:  defect                            |             Status:  new   
   Priority:  major: does not work as expected  |          Milestone:        
  Component:  Rasters                           |            Version:  HEAD  
   Keywords:                                    |   Platform_version:        
   Platform:  OS X                              |           Must_fix:  No    
Status_info:  0                                 |  
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 In 0.9.1 ECW display is instantaneous, no matter how large the ECW was,
 probably because it used the inherent overviews.  In 0.10.0 ECW takes a
 lot longer to display.

 As a example, any of the Blue Marble ECW images takes about a minute
 before anything is displayed, during this time there is a lot of disk read
 activity.  I gave up waiting for the Landsat742 ECW to display.  I hadn't
 tried until now, but it's the same with 0.9.2rc1.  I wonder if Qgis is not
 reading the overviews now?

 I don't have a large JP2 to try, but I wonder if they have the same
 problem, since both ECW and JP2 have inherent overviews.

 OSX 10.5.2, GDAL 1.5.1.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/1084>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats