Changes between Initial Version and Version 1 of Ticket #5251


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Timestamp:
Sep 26, 2013, 7:42:12 AM (11 years ago)
Author:
klokan
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  • Ticket #5251 – Description

    initial v1  
    11We are opening GDAL datasets in our software and users can choose a color which becomes NODATA. This runs great for files with lossless compression, but if it is applied on lossy compressed files it produces visual artifacts.
    22
    3 Workaround is to preprocess the input files with the nearblack utility, but it quite complicated step for the users.
     3Workaround is to preprocess the input files with the nearblack utility (http://www.gdal.org/nearblack.html), but it quite complicated step for the users.
    44
    55It would be great if our C/C++ software could call a method that creates a small possibly compressed 1bit band into a temporary file with specified name. This temporary file should be then usable as the external mask band for the original input file which can be opened even in read-only mode.
    … …  
    1010
    1111The various colors (values per band) should be supported as well, as in #4085
     12
     13Related may be GDAL RFC15:
     14http://trac.osgeo.org/gdal/wiki/rfc15_nodatabitmask