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1

A blog entitled Help! My ECW has speckled edges! from Hexagon Geospatial covers this topic quite well because knocking out pixels is not a reliable solution. If the ECW was created with an Opacity Band, QGIS would use this as an Alpha band. If you received the rail corridor ECW image from a third-party data supplier, I would go back to them and ask that ...


2

Perhaps dissolve the polygons together. Another option: within symbology you can select "no color" for the border of the polygons.


3

You can set the page background to transparent by creating a transparent symbol and setting the page background to use that symbol: transparent_fill = QgsFillSymbolV2.createSimple({ 'outline_style': 'no', 'style': 'no'}) c.setPageStyleSymbol( transparent_fill ) There's also a few other things wrong with your script: First, mapRenderer = ...


2

I'm guessing the areas with no imagery all have the same NoData value? right click on your layer and select "Layer Properties" go to "Transparency" top right "Additional No Data values" enter the value of the white areas


1

First of all I would place the raster as the bottom layer, then the white cells won't hide anything. If this is not an option try the layer Properties > Transparency tab. With the plus sign you can define color transparency for a specific color.



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