How do I free a PixMap from memory?

I want to load a PixMap, retrieve some colors and than delete it.
It sounds so simple to do, but I have no clue.
"Release"? (has something to do with an integer)
"flushmem"? (Identifier flushmem not found)
"AAARG" (help is apreciated)

MyPixmap=null

(=null is the general 'release' in BMax, also works on other stuff)

Load another pixmap in it's place? Wait for the variable to go out of scope? Remove it from it's collection?

If you create in in it's own function you can use local mypixmap:TPixmap=loadpixmap("blah.png"), extract your colours and when you exit the function the pixmap will be gone. e.g. Going out of scope.

Graphics 640 , 480
GCSetMode 2 ' Turn off auto-GC and do it manually
GCCollect()
Print "Before we start " + GCMemAlloced()
extract_colours("max.png")
GCCollect()
Print "Pixmap gone " + GCMemAlloced()
Function extract_colours(filename:String)
	GCCollect()
	Print "Pre-pixmap " + GCMemAlloced()
	Local mypixmap:TPixmap = LoadPixmap(filename)
	GCCollect()
	Print "Post pixmap " + GCMemAlloced()
End Function

and pixmap=null

Graphics 640 , 480
GCSetMode 2
GCCollect()
Print "Before we start " + GCMemAlloced()
'extract_colours("max.png")
Local mypixmap:TPixmap=LoadPixmap("max.png")
GCCollect()
Print "Pixmap alloc " + GCMemAlloced()
mypixmap = Null
GCCollect()
Print "Pixmap nulled " + GCMemAlloced()

<Edit> You do know that Bmax has auto-garbage collection... don't you?"

Thank You CS_TBL!
Thank You FlameDuck?
[edit]
Thank You tonyg!
Yes, I knew about auto-garbageCollection, but I gues I didn't understand most of it.
[edit again]
Plus! Some explanations in Help are outdated or ? Because f.e. in some example by Mark himself (Keyword Release) he uses the function MemAlloced(), wich is not a BMax-function (anymore???). Stuff like that is rather confusing...

yes yes, the manual.. pull a number and join the line please. :P