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Upgrading to TeXlive 2014 (with the latest packages as of today) solved the problem.


Credit due to Paulo Cereda: "What if I tell you your Gimp image has a slightly transparent background, but not completely empty?" for giving the decisive hint. As it appears, the cause of the problem lies in how I generated the *.png in Gimp: Steps to reproduce (what I did) in gimp: add alpha channel highlight section to be made transparent Colours > ...


I think you have two options, either you mix the color with white to fake the opacity or indeed you don't connect them with a single line but draw each segment separately \documentclass[tikz]{standalone} \begin{document} \begin{tikzpicture} \path(0,0) -- (7,0.5) \foreach \x[count=\xi from 0] in {0,0.1,...,1}{node[fill opacity={1-\x},circle,blue,pos=\x,fill] ...


You have multiple options to create a Scalable Vector Graphics (SVG) image, or a raster Portable Network Graphics (PNG) file from the compiled PDF. For creating an SVG from the PDF file I'd recommend using Inkcscape since it is a multiplatform application which runs on Linux, Windows and OS X. For creating a raster PNG I'd recommend using Gimp, which is ...


I had the same issue with exporting pdfs from inkscape. The work around was to export into ps and then convert pstopdf, e.g. with Adobe Distiller or other tools.


You can add a (white) background fill to the figure. I used the approach suggested by Alain Matthes in this answer. For some reason, manual scaling of the background fill was needed. Otherwise the dimensions of the figure would grow. It also appears that the background fill doesn't quite cover the whole image area. The images below are screen captures from ...

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