well....I can get this fairly easily.
Filters -> Blur -> Median Blur (using default values)
Tools -> GEGL Operations -> Color Warp Set To colour to White. Set the Weight to a really large value. Colour pick the From colour and adjust.
50 second demo: https://i.imgur.com/yi59aIM.mp4
You might improve on that, try one of the gmic sharpen filters, but as the other posts, you are coming from a poor starting point.
Filters -> Blur -> Median Blur (using default values)
Tools -> GEGL Operations -> Color Warp Set To colour to White. Set the Weight to a really large value. Colour pick the From colour and adjust.
50 second demo: https://i.imgur.com/yi59aIM.mp4
You might improve on that, try one of the gmic sharpen filters, but as the other posts, you are coming from a poor starting point.