Dear Christian Martel,

A new post on the topic "Can't change color of a QR code" by z3z:
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Hi, welcome to the forum.The problem is that you're using a vector software program to edit a raster file. PNG files are raster, or bitmpa, files, not vector. Some of Inkscape's filters will work on rasters, but things like changing colour via Fill & Stroke only work on vector objects.Try using Trace Bitmap to create a vector copy of your png (it's on menu Path > Trace Bitmap) and see how you go from there. It's possible the trace will not have 100% accuracy, and I don't know if that will screw up your code, but you can try playing with the settings.
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Link: http://www.inkscape.org/forums/questions/cant-change-color-of-a-qr-code/#c26506

All the best,
 Inkscape.org Website

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