Changes between Initial Version and Version 1 of Ticket #3975


Ignore:
Timestamp:
Mar 14, 2011, 1:03:19 AM (13 years ago)
Author:
fclaudel
Comment:

Legend:

Unmodified
Added
Removed
Modified

  • Ticket #3975 – Description

    initial v1  
    1 Creating a lossless JPEG2000 image with JP2KAK from a signed or unsigned 16-bit image causes artefacts in the image, in the places with strong radiometric transitions, and also where extremal values are used.
     1Creating a lossless JPEG2000 image with JP2KAK from a signed or unsigned 16-bit image causes artefacts in the image, in the places with strong radiometric transitions, and also where extremal values are used.[[BR]]
    22
    3 Test source images are :
    4 1 - an elevation model (TIFF signed 16 bit), with elevation in meters, and large NoData regions -nodata value is DTED : -32767.
     3Test source images are :[[BR]]
     41 - an elevation model (TIFF signed 16 bit), with elevation in meters, and large NoData regions -nodata value is DTED : -32767.[[BR]]
    552 - same image with a +32768 offset (range between 1 and around 34000), stored as TIFF unsigned 16 bit
    66
    … …  
    1111Platform is Windows XP (Visual 2008)
    1212
    13 To reproduce : 
     13To reproduce :[[BR]]
    1414gdal_translate -of JP2KAK -co QUALITY=100 <input.tif> <output.jp2>
    1515 
    16 Note :
    17 Using kakadu tools there is no problem : Creversible is used instead of QUALITY=100
     16Note :[[BR]]
     17Using kakadu tools there is no problem : Creversible is used instead of QUALITY=100[[BR]]
    1818kdu_compress.exe -i <source>.tif -o <target>.jp2 Clayers=12 Creversible=yes