Hasselblad CF DIGITAL CAMERA BACK RANGE User Manual page 176

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Grain limit: Prevents the filter from sharpening low-contrast features in
the image, such as film grain, noise, or textures. It works by comparing
brightness of each pixel to the brightnesses of its surrounding pixels. If
brightnesses differ by less than the Grain limit, then no sharpening is
applied to the target pixel. If your image looks grainy after sharpening,
try to increase the Grain limit setting.
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Radius: Sets the radius in which the unsharp masking algorithm looks
for sharp edges. The larger the radius, the more extensive the
sharpening effect will be. The setting you choose will depend on the
contents of your image and the resolution you are using. Generally, use
a large radius with high-resolution images. Use a smaller radius for
lower resolutions images.
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Reset button: Returns the filter to its default settings (Amount=0, Dark
limit=10, Grain limit=0, and Radius=1). None of your other FlexColor
setting will be affected.
It is also possible to apply different amounts of sharpening to each color
channel. This is controlled on the USM tab of the Setup window. See
"USM (Unsharp Masking) Tab" on page 36 for instructions.
FlexTouch Filter
For scanner use only!
Software Reference - FlexColor 4.0 for Camera Backs
The Texture Window
Using the Texture Window
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