I am using RMagick to do multi-stage processing of some images.

Can I have two different rules to process .PNG files in two different 
directories?

rule stage_0/*.png => source/*.png do |t|
   make_0 t.source, t.name
end

rule stage_1/*.png => stage_0/*.png do |t|
   make_1 t.source, t.name
end


I can't seem to get this to work, and don't know if it is supposed to.

Thanks.