OK thanks, but I do not understand.

Adding a tiff in a single band, I can remove the black-background but I
loose true colors, like here :
http://geo-ids.fr:9322/geoserver/hgmap/wms?service=WMS&version=1.1.0&request=GetMap&layers=hgmap:courdi_drone1&styles=&bbox=1.9988911320862897,49.03402197991782,2.0052071448892046,49.03839262998014&width=512&height=354&srs=EPSG:4326&format=application/openlayers
<http://geo-ids.fr:9322/geoserver/hgmap/wms?service=WMS&version=1.1.0&request=GetMap&layers=hgmap:courdi_drone1&styles=&bbox=1.9988911320862897,49.03402197991782,2.0052071448892046,49.03839262998014&width=512&height=354&srs=EPSG:4326&format=application/openlayers>
  

How can I set true colors ?

And if I use "Image Mosaic", I must create directory with my raster into,
but I think it is not necessary, no ? 



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