For an example, the author says, "The Tower Bridge picture had Hue -36 and Saturation +42."A very simple technique involves just two Hue and Saturation (H/S) adjustment layers.
* Create a H/S Adjustment layer with no adjustment. Change the layer blend mode to Color
* Create another H/S Adjustment layer with Saturation at minus 100.
* Return to first H/S layer and tune the black and white effect using the Saturation and Hue sliders.
http://www.northlight-images.co.uk/arti ... white.html
How would the recipe translate to PWP? In particular, what does "Hue -36" become in PWP?
A procedure I stumbled on was even more dramatic applied to the author's Tower Bridge example:
- * Reduce the image to 0 saturation.
* Make a saturation contrast mask as DEN suggested for other uses: Composite | Absolute Difference, middle gray color for overlay; Levels | Full Range, HSL, and reduce saturation to 0.
* Composite | Blend the two derived images, weighting the contrast mask an amount around 25%.
* Brightness Curve | apply an S-curve to increase contrast