The Photoshop CS2 Book for Digital Photographers [Electronic resources] نسخه متنی

Noise Reduction in Camera Raw

While you're processing your image, if you notice that your image has digital noise (those annoying red-and-green spots or splotchy patches of color), you can reduce that noiseespecially the color partfrom right within Camera Raw.

Step One

Open a RAW image in Camera Raw that has a digital noise issue, press Z to get the Zoom tool, and zoom in tight so the noise is easily visible. There are two types of noise you can deal with in Camera Raw: (1) high ISO noise, which often happens when you're shooting in low-light situations, especially when using a high ISO setting (hence the name); and (2) color noise, which can happen even in normal situations (this noise is more prevalent in some cameras than others).

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Step Two

Click on the Detail tab along the right side of the dialog. To decrease the amount of color noise, drag the Color Noise Reduction slider to the right. As you can see, it does a pretty fair job of removing the color noise, though it does tend to desaturate the overall color just a bit. That's why it's good to zoom out to see the preview so you don't wash out the photo. If the problem is mostly in shadow areas (high ISO noise), you can use the Luminance Smoothing slider in the same waydrag to the right to reduce the noisebut use this carefully, because it can tend to make your photo look a bit soft.

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