Entering "p" at the Main Menu will allow you to change how the picture is used by SPC.

{{{
Main Menu: Q 0123O IUCRSG NVAMBX DEPL FZH? p
 >p                                                                               
 Input 12-character picture name.
P3T11L2H0201

 0. No change
 1. Tuck it away
 2. Ingore image in Vlm
}}}

'''1. Tuck it away:''' This will either tuck or untuck a picture.  Tucking a picture strips all the landmark information from the SUMFILE and flags in with "!" in PICTLIST.TXT so LITHOS will ignore it when introducing new images. [From LITHOS.f]
 
'''2. Ingore image in Vlm:''' This will flag an image so that it will not participate in the determination of the landmark position Vlm (i.e. a "v1"), but will contribute to the determination of topography through its brightness variations. [From LITHOS.f]