I exported 2 raster bands of Sentinel II (band 4 and band 8) to calculate NDVI (B8-B4)/(B8+B4), these 2 rasters are in EPSG:32630 - WGS 84 / UTM zone 30N. I'm currently using QGIS 3.26.1.

When I try to use raster calculator to do this NDVI my resluts are really bad, here are parameters I putted in :

I'm supposed to have something that looks like what you can see on the left picture but I have what is on the right.

__________________desired result _____________________________________ result obtained enter image description here

  • 1
    Which version of QGIS do you use?
    – GisUser
    May 9, 2023 at 14:02
  • 1
    please edit your question to explain exactly what you think is wrong with your output
    – Ian Turton
    May 9, 2023 at 14:30
  • Used Bands seems good, Raster calculator runs so there is no error?
    – MarcM
    May 9, 2023 at 14:37
  • I'm sorry I reversed the results in the text, I just edited it. @Matt May 11, 2023 at 6:28
  • The results seem to be wrong because I have in result this kind of mixture between the 2 bands that you can see on the right image. I am trying to get something that looks like the one on the left. @MarcM May 11, 2023 at 6:33

2 Answers 2


I found something that works, I don't know if that's the main reason why my operation didn't work.

When I wrote the question the layers obtained by exporting the Sentinel II data were in "jp2" format, I noticed that when I re-saved them in GeoTIFF and used the raster calculator, I didn't have this problem anymore.


I frequently have the same problem ... Formula for NDVI in raster calculator generates two 'twin images' as shown (QGis version 3.32.1-Lima, on Windows). Doing the exact same process in Saga-Gis as well as in 'SAGA Next Gen' (within Qgis toolbox) results in a correct one.

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