To make an RGB composite in QGIS:
1. Open QGIS and click
2. Browse to the directory with the individual images. Hold down the
Ctrl key and click on the image files to make a multiple selection. Click Open.
3. Create a single Mosaic image from all these individual images.
4. Click .
5 .In the Merge dialog, click Select...
6. In the Input files browse the directory that contains all the individual geotiffs. Hold
Ctrl key and select all the subsets.
7. Click Select... next to Output file and name the output.
8. Click OK...
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