[QGIS-trac] [Quantum GIS] #3461: slow image load visualization for tfw with rotation parameters

[Quantum GIS]

#3461: slow image load visualization for tfw with rotation parameters
--------------------------------+-------------------------------------------
   Reporter:  mescal72          |              Owner:  nobody       
       Type:  bug               |             Status:  new          
   Priority:  minor: annoyance  |          Milestone:  Version 1.7.0
  Component:  Build/Install     |            Version:  Trunk        
   Keywords:                    |   Platform_version:               
   Platform:  All               |           Must_fix:  No           
Status_info:  0                 |  
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 When I try to load or visualize raster ortophoto (abotu 120 Mb) with
 rotation parameter in the header file (tfw) qgis is freezing for 40-50
 sec. I have to wait the same time for every pan/refresh operation.
 If the rotation parameters is set to zero the image is loaded just in few
 second.
 The same raster (with rotation parameters) works fine with others GIS
 application, as udig for example.
 The italian list suggest me to open a ticket.
 I can't attach the image due to size limit but I think the problem
 is the same with all image

 This is the GeoTIFF info:

 Driver: GTiff/GeoTIFF
 Files: 0021_00211001_rgb.tif
 Size is 7680, 13824
 Coordinate System is:
 PROJCS["WGS 84 / UTM zone 32N",
     GEOGCS["WGS 84",
         DATUM["WGS_1984",
             SPHEROID["WGS 84",6378137,298.257223563,
                 AUTHORITY["EPSG","7030"]],
             AUTHORITY["EPSG","6326"]],
         PRIMEM["Greenwich",0],
         UNIT["degree",0.0174532925199433],
         AUTHORITY["EPSG","4326"]],
     PROJECTION["Transverse_Mercator"],
     PARAMETER["latitude_of_origin",0],
     PARAMETER["central_meridian",9],
     PARAMETER["scale_factor",0.9996],
     PARAMETER["false_easting",500000],
     PARAMETER["false_northing",0],
     UNIT["metre",1,
         AUTHORITY["EPSG","9001"]],
     AUTHORITY["EPSG","32632"]]
 GeoTransform =
   32339334.7755, 0.249, 0.018
   5003594.055500001, 0.018, -0.249
 Metadata:
   EXIF_BitsPerSample=16 16 16
   EXIF_Compression=1
   EXIF_PhotometricInterpretation=2
   EXIF_Orientation=1
   EXIF_SamplesPerPixel=3
   EXIF_XResolution=(833.333)
   EXIF_YResolution=(833.333)
   EXIF_PlanarConfiguration=1
   EXIF_ResolutionUnit=3
   EXIF_Software=Adobe Photoshop CS2 Windows
   EXIF_DateTime=2008:10:16 08:59:35
   EXIF_ColorSpace=65535
   EXIF_PixelXDimension=7680
   EXIF_PixelYDimension=13824
   AREA_OR_POINT=Area
 Image Structure Metadata:
   COMPRESSION=DEFLATE
   INTERLEAVE=PIXEL
 Corner Coordinates:
 Upper Left  (32339334.776, 5003594.056) (129d24'8.65"W,Invalid angle)
 Lower Left  (32339583.608, 5000151.880) ( 78d11'7.42"W,Invalid angle)
 Upper Right (32341247.096, 5003732.296) ( 68d14'50.72"W,Invalid angle)
 Lower Right (32341495.928, 5000290.120) (  6d30'39.61"W,Invalid angle)
 Center      (32340415.352, 5001942.088) (120d44'35.31"E,Invalid angle)
 Band 1 Block=256x256 Type=Byte, ColorInterp=Red
   Overviews: 3840x6912, 1920x3456, 960x1728, 480x864
 Band 2 Block=256x256 Type=Byte, ColorInterp=Green
   Overviews: 3840x6912, 1920x3456, 960x1728, 480x864
 Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
   Overviews: 3840x6912, 1920x3456, 960x1728, 480x864

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3461>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats