FC E - File Contouring - External contour levels

PURPOSE

Computes image contours by density foldover. As 'FC' except that bottom level and increment for contouring are supplied externally.   Example.

SEE ALSO

FC	[File Contouring]
DF	[Density Foldover]

USAGE

.OPERATION: FC E

.INPUT FILE: PIC001
[Enter name of image file to be contoured.]

.OUTPUT FILE: FIC001
[Enter name of output file.]

.BOTTOM LEVEL: 0.5
[Enter level of first contour.]

.INCREMENT: 0.1
[Enter contouring increment.]

.OVERWRITE (Y/N): Y
[This option specifies the output file format as in 'FC'.]

If 'Y' is specified for overwriting, SPIDER asks:

.(W)HITE, (B)LACK, OR (A)DJUSTED CONTOURS: W
[Enter 'W' for white contours (i.e., maximum density), 'B' for black contours (i.e., minimum density), or 'A' for contours of maximum or minimum density, depending on the density of the surrounding image.]

SUBROUTINES

CNTRFL

CALLER

UTIL3