Mask Visibility Percentage Attribute
| Tag | (0028,9478) |
|---|---|
| Type | Conditionally Required (1C) |
| Keyword | MaskVisibilityPercentage |
| Value Multiplicity | 1 |
| Value Representation | Single (FL) |
The percentage of visibility of the mask frame during a subtracted display. A value of 0 corresponds to subtracted display, a value of 100 corresponds to un-subtracted display (native). See Section C.8.19.7.1.
Note
The value of 100 is equivalent to Recommended Viewing Mode (0028,1090) having a value of NAT.
Required if Recommended Viewing Mode (0028,1090) equals SUB.
Section C.8.19.7.1
C.8.19.7.1 XA/XRF Multi-frame Presentation Module Attribute Descriptions
C.8.19.7.1.1 Mask Visibility Percentage (Informative)
An example of the usage of the Mask Visibility Percentage (0028,9478) Attribute is illustrated below.
Assume that Psub is the output pixel level of a subtracted frame, its calculation can be expressed as followed:
Pcontrast: Pixel level of the contrast frame in the logarithmic domain
Pmask: Pixel level of the mask frame in the logarithmic domain
X: Mask Visibility Percentage (0028,9478): 0 <= X <= 100
Psub = Pcontrast- (1- X/100) * Pmask