Although the Photoshop Color Fill method (described here) is convenient for general toning, the tint is applied uniformly across the brightness scale. It may not be suitable for all images.

What if we want slightly neutral high values - or strongly neutral shadows - or strongly tinted mid tones ? What if we want the ability to apply tonal adjustments gradually, without any conspicuous gaps or transitions along the brightness scale ?

The Advanced Color Fill Method allows us to apply a tone as a Curves adjustment layer, with all the control that provides.