Dust, Scratches and Light Leaks

Bennp2000

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Name
Paul
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Hi all,
I've been thrust into the roll of graphic designer / web guru at my place of business simply because the other guy who knew how to turn the computer on left (this is a gross exaggeration but is almost accurate).

Anyhow, I'm trying to make a web banner for an upcoming event for which a simulated black board effect looks quite good. Whilst I'm at home I can happily create dust, scratches and light leaks using AlienSkin Exposure 4 (I love this program for quick film-presets btw.) yet at work I don't have access to this and don't feel quite right (nor could I realistically) do these things at home and take them to work.

Could someone advise me how in photoshop you can render light leaks (orangey red colour only gradients I suppose) and dust / scratches. It's possible to get textures of the latter for free online (licensed) but how do you superimpose these as a layer to only add texture, no colour etc.?

I made a quick mock-up of what I was aiming for:


header by travelswithmyt4, on Flickr

Any other advice in a similar vein is very much welcome (I applied some texture behind the text on a previous attempt but this lost the vibrance of the colours etc.

As ever, thanks for your time advice,
Paul
 
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