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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.

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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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