QGIS uses small image preview icons for its layers in the legend and layer tree. How can I create these for a given layer as an image object (QIcon or QImage I presume)?

enter image description here

As I am looking for a PyQGIS solution, here is my existing code:

layer = iface.activeLayer()

How do I get this layer's preview icon?

1 Answer 1


For a QgsVectorLayer:

>>> renderer = layer.renderer()
>>> legendSymbolItems = renderer.legendSymbolItems()
>>> legendSymbolItem = legendSymbolItems[0]  # more if more classes
>>> symbol = legendSymbolItem.symbol()
>>> symbol.asImage(QSize(256, 128))
<PyQt5.QtGui.QImage object at 0x7fd869197d80>

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