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--- jvs:fscan:manual:chapter2:expression:rgb [2014/08/04 16:03]
127.0.0.1 external edit
+++ jvs:fscan:manual:chapter2:expression:rgb [2023/02/23 18:43] (current)
@@ Line 1: / Line 1: @@
 **fScan Reference Manual, Chapter 2 (CmdLineOptions:Expr): rgb**
-===== rgb -- =====
+===== rgb -- manipulate voxel color =====
- **usage:  -expr rgb **\\
+ **usage:  -expr rgb [flag] [WORDSIZE wdsiz] **\\
+The RGB expression can be used to convert to or from 24-bit (or 32-bit) RGB values.
+Converting 8-bit or 16-bit
+to gray-scale values or to new RGB values with rearranged color byte order.  The RGB operator
+When converting RGB values, the FLAG option can be used to specify the conversion method.\\
+FLAG values:\\
+  * 0 - convert as RGB magnitude (sqrt(r*r+g*g+b*b)); this is the default conversion
+  * 7 - convert to maximum of Red or Green or Blue values
+  * 15 - convert 24-bit RGB to 15-bit RGB (5 bits per color)
+  * 16 - convert 24-bit RGB to 16-bit RGB (5 bits RED, 6 bits GREEN, 5 bits BLUE)
+  * 123 - convert to BGR (blue is high byte, red is low byte)
+  * 321 - convert to RGB (red is high byte, blue is low byte)
+  * xyz - like above where X,Y,Z specify byte order; 1=BLUE, 2=GREEN, and 3=RED
 **See Also:**\\
 [[jvs:fscan|fScan Home]],

Brain Imaging & Analysis Center