No-data pixels behaviour on Mosaic Application

Hello,

I’m trying to use the Mosaic Application with images containing no-data. I ran several tests, I notice a strange fading effect frontier area . It seems that the distance between images takes no-data area into account whereas for the composition they are ignored, this cause the fading effect to decrease over no-data area. The documentation says only that no-data pixel are ignored for compositing. I use OTB 9.1.

I put on data.zip 4 images to reproduce this : 30TYP.tif containing only one value (2) and -1 for no data pixels 31TCJ.tif containing only one value (1) mosaic_out.tif create with otbcli_Mosaic -il 30TYP.tif 31TCJ.tif -comp.feather large -out mosaic_out.tif mosaic_out_nodata.tif create with otbcli_Mosaic -il 30TYP.tif 31TCJ.tif -comp.feather large -out mosaic_nodata_out.tif -nodata -1