Neutral Density Gradient Filter


One of the most popular lens filters for outdoor photographers is the Neutral Density filter, because often (especially when shooting scenery, like sunsets) you wind up with a bright sky and a dark foreground. A Neutral Density gradient lens filter reduces the exposure in the sky by a stop or two, while leaving the ground unchanged (the top of the filter is gray, and it graduates down to transparent at the bottom). Well, if you forgot to use your ND gradient filter when you took the shot, you can create your own ND effect in Photoshop.

Step One

Open the photo (preferably a landscape) where you exposed for the ground, which left the sky too light. Press the letter D to set your Foreground color to black. Then, go to the Layers palette and choose Gradient from the Create New Adjustment Layer pop-up menu at the bottom of the palette.

Step Two

When the Gradient Fill dialog appears, click on the little, black downward-facing arrow (it's immediately to the right of the Gradient thumbnail) to bring up the Gradient Picker. Double-click on the second gradient in the list, which is a gradient that goes from Foreground to Transparent. Don't click OK yet.

Step Three

By default, this puts a dark area on the ground (rather than the sky), so click on the Reverse checkbox to reverse the gradient, putting the dark area of your gradient over the sky and the transparent part over the land. Your image will look pretty awful at this point, but you'll fix that in the next step, so just click OK.

Step Four

To make this gradient blend in with your photo, go to the Layers palette and change the blend mode of this adjustment layer from Normal to Overlay. This darkens the sky, but it gradually lightens until it reaches land, and then it slowly disappears. So, how does it know where the ground is? It doesn't. It puts a gradient across your entire photo, so in the next step, you'll basically show it where the ground is.

Step Five

In the Layers palette, double-click on the thumbnail for the Gradient adjustment layer to bring up the Gradient Fill dialog again. To control how far down the darkening will extend from the top of your photo, just click once on the Gradient thumbnail at the top of the dialog. This brings up the Gradient Editor. Grab the top-right white color stop above the gradient ramp near the center of the dialog and drag the color stop to the left; the darkening will "roll up" from the bottom of your photo, so keep dragging to the left until only the sky is affected, and then click OK in the Editor.

Step Six

By default, the gradient you choose fills the entire image area, smoothly transitioning from a dark gray at the top center to transparent at the very top. It's a smooth, "soft-step" gradient. However, if you want a quicker change from black to transparent (a hard step between the two), you can lower the Scale amount in the Gradient Fill dialog.

Step Seven

Also, if the photo you're working on doesn't have a perfectly straight horizon line (maybe you're photographing the sky over an angled roof), you also might have to use the Angle control by clicking on the line in the center of the Angle circle and dragging slowly in the direction that your horizon is tilted. This literally rotates your gradient, which enables you to have your gradient easily match the angle of your horizon. When it looks good to you, click OK to complete the effect.

Before: Exposing for the darn barn makes the sky too light.

After: The barn is the same, but the sky is now bluer and more intense.



    The Photoshop CS2 Book(c) for Digital Photographers
    The Photoshop CS2 Book for Digital Photographers (Voices That Matter)
    ISBN: B002DMJUBS
    EAN: N/A
    Year: 2006
    Pages: 187
    Authors: Scott Kelby

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