Changing the font size and the color of QwtPlot scale labels

[Uwe]

The colors of the axes depends on the palette of the scale widget: QPalette::Text is used for the labels, QPalette::Foreground ( = QPalette::WindowText ) for ticks and backbone.
You can overrule the widget palette by overloading QwtAbstractScaleDraw::label(), where you can set individual colors for each tick label.

For your use case I would simply do something like "plot->setPalette( Qt::darkGray );". The constructor of QPalette will create colors with good contrasts and all scale widgets inherit the palette from the plot.

Concerning the font of the tick labels: "plot->axisWidget( ... )->setFont( ... );" Note, that the font can also be overruled in a similar way like the colors.

Uwe