Bug report #16396

Updated by salvatore fiandaca over 1 year ago

Combination of blending techniques can be used to produce a composer map item that achieve transparency in composer view but is exported as an opaque white object when exporting to PNG.

I produced a demonstration .qgs file embedded in the attached zip.



This is what you see in the composer.

!qgis_view.png!

This is what you get when opening the resulting png using gimp.

!gimp_view.png!



As you might notice map 3 & 4 both achieve transparency because the yellow rectangle in the background is visible in the resulting png.

However a white background is applied on map 4 for whatever reason.



Tested on windows 10 & Ubuntu 14.04 with Qgis 2.18.5

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