When I select a point in a scatter plot I want all the other unselected points to have a low opacity but without showing the density effect (i.e. non accumulative)
In a normal plot setting the opacity outside the marker achieves this but unselected doesn’t have an opacity attribute.
Hi @sabri, welcome to the forum! I think what you want to decrease is not the opacity (which will let the other markers show through it), but the saturation of the color (as in HSV colors). You can pass plotly colors as hsv strings (eg 'hsv(0,100%,100%)') so you could just decrease the saturation of non-selected points.