Using Noise Reduction - Blackmagic Design Cintel Scanner Installations- Und Bedienungsanleitung

Using Noise Reduction

The following procedure suggests a method of using the NR noise reduction parameters to
achieve a controlled result.
Applying noise reduction to an image:
1 Enable temporal NR by choosing 1 to 5 frames from the 'number of frames' menu. Keep in
mind that more frames dramatically increase the render time of this effect, while it may or
may not significantly improve the result, depending on your material.
2 Choose options from the 'motion est. type' and 'motion range' menus corresponding to how
much motion is in the image. If there's a lot of motion, you may need to choose 'better' and
'large'. If there's not very much motion, lesser settings may suffice.
3 With luma and chroma threshold linked, slowly raise either parameter until you just start
to see a reduction in noise within nonmoving areas. Then make smaller adjustments
to determine the maximum amount you can add without creating artifacts or overly
softening detail.
4 If there's obviously more chroma than luma noise in the image, you can disable luma and
chroma linking at a satisfactory level of luma noise reduction, and then raise the chroma
threshold to address color speckling in the picture.
5 Suppose you're not satisfied with the tradeoff between the maximum possible threshold
of noise reduction and the prevention of motion artifacts. In that case, you may want to
adjust the motion threshold setting, lowering it to omit more of the motion from the noise
reduction operation, or raising it to include more motion. If you're still not satisfied, you can
also try better 'motion est. type' and 'motion range' settings.
Keep in mind that the strength of temporal NR is to reduce noise in unmoving parts of the
image. When you've achieved the best tradeoff between noise reduction in the still areas
and avoidance of motion artifacts in the moving areas of the image, it's time to turn to
spatial NR to further eliminate noise throughout the rest of the picture.
6 Enable spatial NR by raising either the luma or chroma threshold parameters, which are
linked by default, until you strike a suitable balance between the reduction of noise and an
unwanted increase in image softness.
7 It's recommended to choose the Enhanced option from the spatial NR mode pop-up, as it
will yield the best possible results. However, this can be processor-intensive, so if you need
better real-time performance, you can switch the mode to Faster and compare results.
8 If there's obviously more chroma than luma noise in the image, you can disable luma and
chroma linking at a satisfactory level of luma noise reduction, and then raise the chroma
threshold to apply more aggressive spatial NR to address color speckling in the picture.
9 If you've had to use a high spatial NR luma or chroma threshold setting to reduce noise
visibly, and areas of detail look a bit chunky or aliased, you can choose a larger setting from
the 'radius' menu to enable a more detailed analysis of the scene.
This will result in higher visual quality, but larger NR radius settings are more processor-
intensive and may reduce real-time performance if you don't have adequate GPU resources
available to your system.
10 If you've found suitable noise reduction settings, but the result is too aggressive and makes
the image appear too processed, you can try raising the spatial NR and/or temporal NR
blend parameters to fade between the noise reduction added by each set of controls, and
the image as it was before you added noise reduction.
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