Deleting by Colour in Photoshop
by David on Feb.14, 2011, under Digital Art, Texturing
Firstly, set your colour selection wand to one pixel tolerance with no aliasing if the colours are very flat and not blended or aliased on the edges and click the colour spot you want to edit. With that colour highlighted, select ‘Similar’ from the Select menu. All colours that are similar will now be highlighted / selected.
You can then delete the colour – deleting replaces those pixels with the background colour, or makes the layer hollow in that space, or you can select Fill from the Edit menu to fill that area. I think you can also you colour overlay in the layer palette if you want to keep the underlying colour intact.
Good little guide here: http://www.brighthub.com/multimedia/publishing/articles/78086.aspx

