Is there a way for QGIS make just the black value (255,255,255) on an .IMG format file transparency. Right now their transparent option makes the whole image transparent.


QGIS has the option to set transparency based on a number of factors no matter the file format you use.

All can be set from the Transparency tab in the raster layer Properties. Just set 100% transparency for red=255, green=255 and blue=255.

QGIS transparency

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