User Guide

Chapter 8 Editing
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by dead or stuck pixels in a digital camera's image sensor. Similarly, dust on a camera lens or scanner
bed can cause noise by blocking or reflecting light.
Noise is visually distracting, so in most cases you will want to reduce noise in your photos. However, if
you reduce noise too much you may unintentionally reduce image sharpness.
ACDSee Pro supports median noise removal. This method of noise removal is called median noise
removal because a mathematical algorithm identifies noisy pixels in a photo and adjusts their values
based on the median (or middle) value of neighboring pixels. Median noise removal is useful for
reducing Gaussian noise, which is the most common type of noise in digital photography because it
originates in a digital camera's image sensor.
You can apply median noise removal to all of the pixels in a square area, to pixels along diagonal lines,
or to pixels along horizontal and vertical lines. ACDSee Pro also has a hybrid option, which you would
use if you want to apply median noise removal to more pixels in a photo, or if you want to reduce the
color variations that are sometimes caused by noise.
Removing noise from an image
You can use the Remove Noise filter to remove noise from your images while preserving details that
you want to retain.
To remove noise from an image:
1 In Edit Mode, on the Edit Panel, click Noise, and then select the Remove Noise tab.
2 Set the options as described below.
3 Do one of the following:
•Click Done to apply your changes and close the Remove Noise tool.
•Click Cancel to discard all changes and close the tool.
Median Noise Removal options
You can use the Remove Noise filter to remove hot image pixels caused by digital
cameras with malfunctioning CCD array sensors, or the extra pixels caused by a
dusty scanner or camera lens.
Despeckle Removes noise.
Square Removes noise using a 3 x 3 pixel square.
X Removes noise using a 3 x 3 pixel X shape. Use this option when you want to
preserve an image's thin and diagonal lines.