**fScan Reference Manual, Chapter 2 (CmdLineOptions:Expr): Gradient**
===== Gradient -- =====
 **usage:  -expr gradient -- create a local intensity gradient map **\\

The GRADIENT function analyzes the local intensity gradient around each voxel and generates a gradient map in which each map value is a composite index of the intensity gradient along the X, Y, and Z axes.

Each map value is a 16-bit integer with 3 5-bit fields, in the binary form:  ZZZZZYYYYYXXXXX\\
Within each field, you should subtract 16 from the 5 bit value (0-31) to get the gradient value (-15 - +15).

The gradient value indicates the average slope of the intensity gradient along that axis.

**See Also:**\\
[[jvs:fscan:manual:chapter2:expression:peak|Peak]]

[[jvs:fscan|fScan Home]], 
[[jvs:fscan:manual|fScan Manual]], 
[[jvs:fscan:manual:chapter2|CmdLineOptions]], 
[[jvs:fscan:manual:chapter2:expression|Expression Command]], 
[[jvs:fscan:manual:help|Manual Help]]