Hot answers tagged transparency
You have to right click on the Layer in the Layers Panel on the left and select Properties where you can then set the Global Transparency for this layer. This works the same no matter your raster or vector format.
I found a solution to my problem: In the transparency tab use the mouse selection tool to add a value from the screen by interactively clicking on a pixel. This will automatically add a new line in the table to the left showing the band characteristics of this pixel. Clicking on apply will then set to transparent all the pixels in the raster with the same ...
See the 'Transparent pixel list' under the Transparency Tab. You could set the ranges for your white pixels in this list and give a 100% transparency.
Not sure what the problem is, I can access Layer Properties > Transparency and change the Global transparency and the Custom transparency options as answered by @Kersten. Alternatively, you can use the Python Console to set your transparency: rlayer = qgis.utils.iface.activeLayer() rlayer.renderer().setOpacity(0.5) # 0.5 = 50%; 0.1 = 90%... ...
Try to use nearblack gdal utility for make raster with transparent background.
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