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Hello, I'm new to this forum (haven't use too many forums either).  Have been a print graphic designer since the dawn of time ( I started with a Mac SE when it first came out!).  Am very familiar with PhotoShop (CS6) , I have a rather unusual request from a client and was hoping someone can shad some light – (if this isn't the right forum, where to ask this question)

You know the Rainbow effect on FaceBook that's been very popular?  Can you tell me how that 's done?  Is it a filter? How to create custom filters in photoshop?  I read somewhere to use Filter Factory, but it seems very complicated to use with CS6 on a Mac.  Your advice is very much appreciated.