I need to perform Gram-Schmidt pan-sharpening, I don't have access to ArcGIS or ENVI so have been using QGIS. Is there any plug-in or similar capability that is available to perform Gram-Schmidt pan-sharpening in QGIS? If not, is this possible in any other open-source software?

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    I don't think QGIS has such a pan-sharpening method. GRASS's i.pansharpen tool has three methods: IHS, Brovey, and PCA. The Orfeo Toolbox has another three methods: RCS, Bayesian Fusion and Local Mean and Variance Matching. – Joseph Jul 4 '17 at 14:22
  • @Joseph I specifically require Gram-Schmidt pan-sharpening - If I understand you (and from what I found when googling), is it correct that GRASS doesn't have this capability? – beadyeyes Jul 6 '17 at 23:01
  • I do not think GRASS has this method (atleast I couldn't find it). – Joseph Jul 7 '17 at 9:09
  • According to harrisgeospatial.com, "You can also write a script to perform pan sharpening using..." harrisgeospatial.com/docs/envigramschmidtpansharpeningtask.html – csk Feb 13 '18 at 18:11

To summarize the comments above at the moment the is no such functionality in QGIS. You could try to implement your own plug-in to perform this task by using this scientific paper: How to pan-sharpen images using the Gram-Schmidt pan-sharpen method-a recipe

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