Hello Humberto,

It looks like it's not possible yet.

There's a gnuplot property for the chart to input Gnuplot scripts, but this command doesn't work.

Recently we started to implement rendering embedded raster graphics with higher resolution (pictures are rendered with original size now).
So we'll check how to render charts in higher resolution.

Hello Sergey,

I understand. Please notice also the possibility of using vector (scalable) output with gnuplot like SVG, which is relatively easy to render on screen and prints with maximum resolution while keeping files with small size and renders natively on HTML on modern browsers.

Cheers,

HB