Problems with QwtPlotRenderer from Qwt 6

[Uwe]

But the exported picture clearly shows much too small axes and labels.
This is the image I already attached:

The image has only 10% in size of the image I have created on my box with your parameters. Guess it gets scaled/compressed by the Forum software ?

I expected that a higher resolution would result in a picture consisting of more pixels (e.g. for publication quality), but with the same relative dimensions of the plot elements.

Please recall that a QImage is simply a matrix of rgb values. If you want something scalable you need to use a scalable vector graphics format like PDF or SVG.

Uwe