[gdal-dev] use scale in gdal_translate

Limei Ran lran at unc.edu
Mon Feb 25 12:20:07 EST 2008


Hi:

I used the following command to scale a image file:
gdal_translate landcover14.img -scale 0 127 0 0 -OF HFA out.img

I thought all pixel values in out.img should be 0.  But, when I use 
gdalinfo out.img, I saw the same information as those in the original 
image, such as:
=======================
.....
Band 1 Block=64x64 Type=Byte, ColorInterp=Palette
  Description = Layer_1
  Min=11.000 Max=127.000
  Minimum=11.000, Maximum=127.000, Mean=100.336, StdDev=38.292
  Metadata:
    STATISTICS_MINIMUM=11
    STATISTICS_MAXIMUM=127
    STATISTICS_MEAN=100.3361000425
    STATISTICS_MEDIAN=127
    STATISTICS_MODE=127
    STATISTICS_STDDEV=38.292430309159
    STATISTICS_HISTONUMBINS=256
    STATISTICS_HISTOMIN=0
    STATISTICS_HISTOMAX=255
......
===============================

I thought min and max should be 0 after scaling.  Could you tell me 
whether there is any problem?

Thanks,

Limei


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