Hi, thx to Jean-Claude and Even, I definitively resolve my troubles. :)
gdalwarp is the right tool to merge.It don't break with no-one raster and after I use gdaltranslate to produce a tiff4 raster.
To help any-one that has same need. I put the call I'm using.The call take all the raster tiff4 available in a folder and merge all in 1 only raster. The SRS is the same (for me EPSG:3003) for source and target. Also I put the level "0" (white" to -srcnodata to avoid that the overlapping of borders covers the raster near.
As show from the image sample here attach.gdalwarp.exe -s_srs EPSG:3003 -t_srs EPSG:3003 -r near -ot Byte -srcnodata "0" -of GTiff -co TFW=YES ../raster/list/*.tif ../raster/raster_result.tif
gdal_translate -co NBITS=1 -co COMPRESS=CCITTFAX4 -co TFW=YES ../raster/raster_result.tif ../raster/raster_result_as_tiff4.tif
Regards, Andrea Peri.
<<attachment: gdalwarp_merge_sample.gif>>
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