The Photoshop® CS Book for Digital Photographers

Removing Color Aliasing

Here’s another quick trick Jim DiVitale and Kevin Ames use for reducing the color aliasing (digital noise) that often appears in digital photos shot in low-light situations.

Step One.

Open a photo that has visible color aliasing (look at the wall behind the subjects, it’s covered with little red, green, and blue dots). Go under the Filter menu, under Blur, and choose Gaussian Blur. Drag the Radius slider all the way to the left, then start dragging to the right until the color aliasing is blurred enough that you can’t see it. Click OK to apply the blur. © KATHY SILER [View full size image]

Step Two.

Go under the Edit menu ...