Is it possible to have a noise filtered effect similar to below, but have the white parts transparent?
My idea is to use this as a CSS background image overlay .png which would allow background colours to show through.
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For Transparent Noise
Another quick way to do it in Photoshop is to:
Filter > Noisefilter and set it as you like
Double-Clickthe (New) Layer or select
Blending Optionin the Layer Panel/menu
This Layer's white point value to around 213—222
Save for Web...PNG-24 with Transparency On
TIP: You can OPT+Click/ALT+Click on the white point to split it into a range
It is much better to use Fireworks. All you need to do
Screenshot - http://cl.ly/image/2h443A131p3k
There is a method that pretty much allows you to do this without thinking at all:
Ctrl+Land bring the upper white arrow to the center enough, so that you will get white background ( Also, you might want to bring the top black arrow towards the center to make the black colors black ) ( This step is not necessary in this case ).
Edit > Define brush preset( Since the Brush tool was selected ), the created brush will straight away be selected.
Ctr+Nwithout the background color ( make it bigger than the original image, so you don't have to aim much ).
D( to default the foreground color to black ).
Image > Trim > Base on: Transparent pixels
It may seem like this has big amount of steps, but you can do this very, very fast.
I built on Kerry's method, works great:
Voila! A layer with a mask which imitates noise
Just found this webapp: http://noisepng.com/
It's exactly what you need, it generates transparent noise background and it has a lot of settings.