Noisy images are annoying. One way to reduce noise is through the channels. Copy the background layer by pressing
Click on the new channel’s miniature icon while holding the Control/Command key to select the content. Activate the “RGB channel” (top-most), and switch back to the Layers palette. When the duplicated background is selected, click on the “Add Layer Mask” icon.
Click on the Layer Miniature icon, and select Filter → Blur → Surface Blur from the menu. Play around with the Radius and Threshold sliders until the noise has been reduced as much as possible. Thanks to the mask you created, the contours are safe.
Control/Command + J,
switch to the Channels palette, and select the channel that shows the
least noise. Drag that channel down to the “New Channel” icon (next to
the trash can) and go to Stylize → Find Edges. Then apply a Gaussian
Blur with a radius of about 3 pixels.
Look at this copy of the red channel.
Click on the new channel’s miniature icon while holding the Control/Command key to select the content. Activate the “RGB channel” (top-most), and switch back to the Layers palette. When the duplicated background is selected, click on the “Add Layer Mask” icon.
Click on the Layer Miniature icon, and select Filter → Blur → Surface Blur from the menu. Play around with the Radius and Threshold sliders until the noise has been reduced as much as possible. Thanks to the mask you created, the contours are safe.
With and without noise
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