How to set transparency to multiple raster values with Python

I found this other thread which was helpful How do I set layer transparency in QGIS 2.0 with Python? It seems like there should be a shorter and more efficient way, but I tested this and it works:

print 'Start'
active_layer = qgis.utils.iface.mapCanvas().currentLayer()
raster_transparency  = active_layer.renderer().rasterTransparency()
ltr = QgsRasterTransparency.TransparentSingleValuePixel()
ltr2 =  QgsRasterTransparency.TransparentSingleValuePixel()
tr_list = []
ltr.min = 0  # Or another value
ltr.max = 0  # Or another value
ltr.percentTransparent = 100  # Or another value
ltr2.min = 8  # Or another value
ltr2.max = 8  # Or another value
ltr2.percentTransparent = 100
tr_list.append(ltr)
tr_list.append(ltr2)

raster_transparency.setTransparentSingleValuePixelList(tr_list)

active_layer.triggerRepaint()  # Tried with iface.mapCanvas().refresh(), but it didn't work
print 'Finish'

Is Python a requirement? If I understand what you want, you can do this in the QGIS UI, in the raster layer properties: enter image description here

Tags:

Python

Transparency

Qgis

Pyqgis

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