Phase One H 5 - Manual (Page 57)

Unsharp Mask
The name “unsharp mask” (USM) can be misleading. Using this tool
actually gives an apparent increase in image sharpness by enhancing
the edge differences between pixels of different colors. When applied,
the software evaluates the contrast differences between pixels and either
enhances the difference or not, based on setting made in the preferences.
There are two controls over the USM:
Amount
The amount of change is entered here as a percent. The higher the
setting, the more sharpening that will be applied.
Threshold
The threshold level controls at what level the sharpening will begin.
At the default “0” setting the sharpening amount is applied to every pixel.
As you adjust the setting up, you control where the sharpening
will begin.
Tools
14.6
Tools
14.7
Compare Captures Side By Side
The active capture file is marked with a white frame, and is the
one that can be edited with a change of gradation curve, gray
balance, color balance or exchanged with a new capture file
from the capture collection. Click on the other capture file to activate it.
Files from different collections can also be compared. Use F2 to access
the active capture files within the collection. The layout of the two
captures is automatically adjusted to make full use of the preview area.
However, if there is lack of space then hide the function tabs by pressing
F6 (see also Expand Preview).
Zoom to Fit Preview
Click to fill the preview window with the image.
Expand Preview
Click to minimize the Function Tabs and expand the Preview
window. To restore the original settings click on the button
again, or click on the Function Tabs
.