I am new to Grass GIS.

I have 17 scenes from Landsat8 covering an area. I have created color infrared images of bands 5,4,3 and now I want to merge all scenes into a mosaic, for further analysis. I can't seem to manage to do this, neither with r.patch or with i.imagine.mosaic.

Does anyone know another way for merging?

I tried also in QGIS, I exported from Grass as tiffs, loaded them into QGIS and used the merge command, but the images become grayscale and with some white corners overlaying.

I am attaching a screenshot of my result in QGIS, at the suggestion of @Joseph.

merge fct


1 Answer 1


I am no expert in rasters (nor in QGIS for that matter) but have you tried manually setting the colours for the bands in QGIS?

Layer Properties > Style > Select "Multiband color" and configure the settings to your requirements.

Raster properties

Apologies for not providing a definitive answer.

  • Hei Joseph, thanks for the reply :) Yes, I am working with composite images, so I am after this step, and that's when I get funny results.
    – Clara
    Sep 16, 2014 at 10:17
  • Could you please upload some screenshots of your results? Hopefully others will recognise the problem and provide you with a solution.
    – Joseph
    Sep 16, 2014 at 10:20

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