Buried away inside the Gradient window is a rather cool effect. It allows you to create highly complex gradient swatches that are useful for a number of effects like backgrounds and textures.
In this Photoshop article I'll show you something you can do with the Noise setting inside the Gradient Option window.
You can create gradients in two ways in Photoshop: Firstly with the Gradient Tool and secondly with the Gradient Overlay Layer Style. I'm going to use the latter as I find it's good for auditioning results and once you have a gradient it will be available in the Gradient Tool if you need more control.
To set this up, create a layer and add a Layer Style.
Check Gradient Overlay and click on the gradient swatch.
In the Gradient Type drop down choose Noise.
You will be immediately be presented with some crazy mess on your layer! This is Gradient Noise.
Now you're not stuck with this mess as there's plenty of control. The first thing you can tweak is the Roughness parameter. This will smooth out the transition between the color and can provide some really nice background effects with the right color palette.
Speaking of color palettes you can choose between three modes of adjusting color: The first is RGB (Red, Green, Blue) then comes HSB (Hue, Saturation, Brightness) and then the LAB (Lightness, a,b opposing color spaces'"don't ask!!) color picker.
The sliders on each color mode will allow you to control or restrict the range of colors used in the noise.
You can also add random transparency to the gradient as well by checking the Add Transparency check box.
The Randomize button is a never-ending source of fantastic looking gradient swatches and you might find it hard to know when to stop with this one.
So what can you do with this? Well, here's a very quick example that's quite fun:
Once you have a gradient you like, convert the Gradient Overlay Layer Style to a new Layer. To do this Control-Click the Layer FX and choose Create Layer.
By default this new layer will be clipped to the layer below so just Option-Click (Alt on the PC) between the layers.
On your Gradient layer apply the Ocean Ripple effect from Effect > Distort > Ocean Ripple. You don't want too much and you can probably see where I'm going with this.
Now you'll need Photoshop Extended for this as we're going 3D! From the 3D menu choose New Shape From Layer > Sphere.
After some adjusting some of the lighting you get a rather convincing gas giant effect.
By adding a bit of Outer Glow and some stars in the background (rendered from After Effects using Particular) you get the start of a nice little space scene:
Obviously this is just one way you can use Gradient Noise. It's great for background effects and don't forget you can use it with the Gradient Shape modes like Radial (planet rings, anyone?), Diamond etc!
Bring on the noise!