Open document. New layer. On new layer, lower opacity and paint those areas you want to keep at the original color.
Control+a, control+f, control+shift+f. Got to selections>save selection>save selection to alpha channel. Control+d.
Click on save.
Delete the painted layer and duplicate the background layer again. Use the Virtual Photography plug-in. Effects>Plug-ins>optickVerve Labs. Choose a b/w filter like old newspaper (or any that is sepia or monotone).
Selections>load from alpha channel.
Make sure replace is checked and then load.
The area that you painted earlier will now have marching ants around it. Make sure the layer you applied the VP to is selected and hit delete on the keyboard.
While it looks fine like this and may be just want you want, you can try lower the opacity on the VP layer to let muted colors of the original layer show through.
Last but not least: Layers>Merge>Merge visible before dragging or copying to your layout.
Jennifer Fox, Little Bitz Dzynz, Mels World, Mikki Livanos, Moon Chylde Creations, Trish H.