Different pixel values for a raster between QGIS and PostGIS

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I have inserted a Landsat raster into PostGIS using the command :

raster2pgsql -I -C -s 28356 -M -t 100x100 /data/LS7_20150425_B40.tif public.red | psql -d postgres -U postgresUsing QGIS, I have opened both my original file and the raster from PostGIS using DB manager of QGIS.

According to QGIS the pixel values are not the same :

• original file : values from 64 to 3687
• raster from PostGIS : values from 10 to 8295

Note: if I export my raster from PostGIS to a new file using GDAL, the file is identical to the original one.

Any explanation about this difference ?



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