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I need to transform RGB map to IHS is that feature available in QGIS?

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The tool to complete this in QGIS is part of a plugin called GRASS.

i.rgb.his

Some resources for learning about this tool and GRASS:

QGIS and Generic Tools by Nicolas Baghdadi, Clément Mallet, Mehrez Zribi

QGIS 2.8 Documention -- link goes directly to GRASS setup section

How to color-balance false-composites of pan-sharpened Landsat images in GRASS?

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  • when I use i.rgb.his I get this error Traceback (most recent call last): File "C:/OSGEO4~1/apps/qgis/./python/plugins\processing\algs\grass7\Grass7Algorithm.py", line 415, in processAlgorithm Grass7Utils.executeGrass(self.commands, feedback, self.outputCommands) – Claudio Clipi Dec 1 '18 at 1:17
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    Please add a new question outlining what you've tried, including the a code snippet and the error message. As we have a one question per post format, if the answer above solved your initial question, please accept the answer. – smiller Dec 1 '18 at 18:50
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The WhiteboxTools plugin for QGIS (Whitebox for Processing) offers RGB => IHS (RgbToIhs tool) and IHS => RGB (IhsToRgb tool) transformation:

enter image description here

The tool takes three input images (corresponding to red, green, and blue) and outputs three images (corresponding to intensity, hue, and saturation). If your input image is single RGB colour-composite just use the SplitColourComposite tool to create the three inputs.

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