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So I'm fairly new when it comes to working with images and creating different effects.

But can anyone explain what effect is being applied to the conference logos in the following link?

The middle of the logo is brighter and as you work your way outward, it gets darker.

enter image description here

Are there any good tutorials to reference in to recreate this effect? I'll be mainly using Gimp for this.

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Can you explain which effect you mean? Beeing unsharp, the bottom of the logo is more in front than the top of the logo, ... – Kurt Feb 19 '13 at 19:40
The middle of the logo is brighter...if you go outward towards the edges it gets darker...sorry for the non-technical terms though. – Muhnamana Feb 19 '13 at 19:51
No problem, I just want to make your question clearer to help you to get a proper answer. I think it would be a good idea to edit your question and include this information ... And welcome to graphicdesign.SE! – Kurt Feb 19 '13 at 20:09
Thanks for your suggestion Kurt...I updated my original question. – Muhnamana Feb 19 '13 at 20:41

This looks like there are two layers on top of the original logo:

  1. Light grey to black radial gradient - in Multiply mode, and
  2. The original logo duplicated and blurred - in Lighten mode - probably with opacity around 50%
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Seems like this may be the case, now to figure out how to replicate the process in Gimp. – Muhnamana Feb 20 '13 at 15:59

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