[gdal-dev] gdal_rasterize processed GTiff filesize question

[Andrey VI]

Hello.
 
I’m using gdal_rasterize to remove some data from DEM (Int16) and hillshade (Byte) rasters with shape-file, like this:
gdal_rasterize -burn -32768 shape.shp dem.tif and gdal_rasterize -burn 0 shape.shp hillshade.tif
Both DEM and hillshade GTiffs created with -co COMPRESS=LZW -co TILED=YES options. After processing with gdal_rasterize the  size of GTiffs becomes 1.5 times larger . Why it happens?  I assumed that it should be the other way around, because a significant portion of the data is replaced with the same values and should be compressed well.
 
Andrey
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