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Red
and green color noise can be easily seen in the picture,
especially on the hand.
 Click
Image/Mode/Lab Color in the menu to switch from RGB Color
to Lab Color. The Channels palette still contains
3 color channels, but they are very different from the others. The
Lightness channel contains the lightness values of the picture.
The graininess appearing on it is called "luminance noise".
Channels 'a' and 'b' are the color channels of the
picture. You can reduce color noise by changing their values.
 Choose
color channel 'a' and click Filter/Blur/Smart Blur.
This filter takes edges into account and blurs them less than intermediate
areas. Thus, it can be used well to filter noise appearing on homogeneous
areas (as noise is more noticeable in such parts).
When specifying values, keep in mind that this solution slightly
blurs colors. It doesn't have any effect on the photo's sharpness
or details as those informations are stored in Lightness.
However, you can easily make your colors dull. Use it with measure
when processing photos with lots of bright colors and small details.
We could still use it excessively in this photo, as it contains
large objects and a huge amount of color noise. We have set Radius
to 8.6 and Threshold to 45.8. Of course, use
set Quality to High, and always keep Mode on
Normal.
If you're done, apply the same effect on color channel 'b'.
We have used the same values but always choose them according to
noise amount.
You can use Noise/Median along with Smart Blur, but
in such a case use Median first, then do a Smart Blur
or a vanilla Gaussian Blur on the same channel.
Click
Image/Mode/RGB Color to switch back to RGB mode. Color noise
has been blurred while we have retained most of the colors. As we
said, the visible graininess is luminance noise. It can be removed
with a similar method, and it will be discussed in a further tip.
Related
Photoshop Tutorials
Removing
color noise II.
Removing
color noise III. (hungarian)
More Photoshop Tutorials
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