how to get that new JSFIDDLE/Twitter/Youtube effect in photoshop?

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As all the big sites have been updating their style recently, I’ve noticed this effect on a few sites and I’m wondering how they do it.

Its like this normal gradient effect, with this pattern, abbit similar to a dissolving effect, but not quite that…

JSFIDDLE:
Its on the top menu bar on this site: http://jsfiddle.net

Twitter:
Again, its on the top black menu bar on http://twitter.com.

Youtube:
Its like the whole of Youtube’s background but its quite hard to notice on that one. http://youtube.com

Do you guys see what I’m talking about?

How would I get that effect in Photoshop?

Thanks

Answer

It’s called ‘noise’. Most raster image editing software have various noise filters.

Attribution
Source : Link , Question Author : Community , Answer Author : DA01

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