How to use image sampler RGB to change the position of points or lattice structure!

I’m trying to change the spacing or density of a grid based on an rgb image, i’ve tried a thread in which david ruetten posted a way to work with circle but this doesnt really work with 3d organic mesh. any help is hugely appreciated

@DavidRutten please help

It’s the weekend and I’m at home with a cold. Please post your file, please link the mentioned discussion. Maybe I’ll feel good enough on Monday to come in to the office.