Gradients between two very similar colors create harsh banding which becomes more noticeable the larger the distance the gradient covers.

Dithering is the process of creating in-between colors using an optical illusion to make sub-band transitions possible.

Currently, Femtovg does not support dithering like other vector graphics libraries, leading to noticeable bands:

Implementing dithering should be as simple as adding additional virtual stops between the gradient stop points with pre-set dithering patterns, see (https://en.wikipedia.org/wiki/Ordered_dithering)[https://en.wikipedia.org/wiki/Ordered_dithering]

This would greatly improve the quality of femtovg's rendering and enable more sleek and polished looking renders.