Jonathan I'm not familiar with the Orfeo tool but I use the SAGA Rgb Composite tool under SAGA\Grid-Visualization\ to stack Landsat scenes. It limits you to three bands which is a bummer, but works well. The tool output is rescaled to 8-bit, so you shouldn't use the stacked imagery for change analysis later, but it’s great for visualization. The GRASS Raster tool r.composite will also stack, but the SAGA tool seems to handle Landsat 7 SLC-off data gaps better. I’m new to QGIS, so some of the above might be wrong... Carl
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