Nik Software Complete Collection NIK-1396 ユーザーガイド
製品コード
NIK-1396
32
Dfine
®
2.0
User Guide
Reducing Noise
Once you have measured the noise inherent to your image, it is time
to start reducing noise. Dfine 2.0 enables you to reduce different
types of unwanted artifacts from your images, including Contrast
Noise, Color Noise, and JPEG artifacts.
to start reducing noise. Dfine 2.0 enables you to reduce different
types of unwanted artifacts from your images, including Contrast
Noise, Color Noise, and JPEG artifacts.
Contrast noise, also referred to as luminance
noise, is represented by darker and lighter specks
appearing in the same color of an object. This
type of noise is most often visible in large, smooth
objects, such as the sky, where the variance of
tonality is most obvious. This type of noise is often
associated with a grainy look in images.
noise, is represented by darker and lighter specks
appearing in the same color of an object. This
type of noise is most often visible in large, smooth
objects, such as the sky, where the variance of
tonality is most obvious. This type of noise is often
associated with a grainy look in images.
Color noise, sometimes referred to as chrominance
noise, manifests itself as random spots of red,
green, and blue. Color noise is most visible against
neutral objects, such as clouds. This type of noise
is often accentuated by saving a file in the JPEG
file format.
noise, manifests itself as random spots of red,
green, and blue. Color noise is most visible against
neutral objects, such as clouds. This type of noise
is often accentuated by saving a file in the JPEG
file format.
JPEG Artifacts are caused by the JPEG compression scheme. The
higher the compression used when saving your images in the JPEG
file format, the more obvious the JPEG artifacts will be in your image.
The JPEG artifacts are often visible as blocking structures with higher
levels of color noise around each block.
higher the compression used when saving your images in the JPEG
file format, the more obvious the JPEG artifacts will be in your image.
The JPEG artifacts are often visible as blocking structures with higher
levels of color noise around each block.
You can choose from one of two methods to either reduce noise
globally from your image or selectively, based on colors or objects
found within your image.
globally from your image or selectively, based on colors or objects
found within your image.
Note: each of the different noise reduction methods is
independent of each other, and you can only apply one method
at a time. For example, the settings made within the
independent of each other, and you can only apply one method
at a time. For example, the settings made within the
Control
Points will not be applied to the image as soon as you select Color
Ranges and vice-versa.
Ranges and vice-versa.
Control Points
The
Control Points noise reduction method is the default mode
applied after measuring your noise. You will notice that even before
moving to the Reduce step, noise reduction is applied on your image
after measuring the image. This noise reduction effect is the
moving to the Reduce step, noise reduction is applied on your image
after measuring the image. This noise reduction effect is the
Control
Points method at its default values.
Within the
Control Points method, you can modify the noise
reduction process globally using the following tools:
Contrast Noise
The
Contrast Noise slider controls the amount of noise reduction
applied to the image that affects contrast or luminance noise. This
noise type is manifested in artifacts of light and dark specks that
appear in what should otherwise be a uniform image detail.
noise type is manifested in artifacts of light and dark specks that
appear in what should otherwise be a uniform image detail.
Change the amount of the
Contrast Noise slider to balance noise
reduction and detail retention. The higher the value of the
Contrast
Noise slider, the more noise reduction will be applied to the image.
If you see the detail structures becoming too soft, try reducing this
slider. If you cannot achieve a good balance, try going back to the
measure step and modifying the profile.
If you see the detail structures becoming too soft, try reducing this
slider. If you cannot achieve a good balance, try going back to the
measure step and modifying the profile.
Chapter 7: Noise Reduction Step 2: Reducing Noise
Color Noise
Contrast Noise