PRO labelimg,headbytes,hival,loval,llx,lly,image_width,image_height,fac $
	    ,psres=psres,color=color,sun=sun,moon=moon $
	    ,camfilt=camfilt,date=date,rot=rot,rang=rang

; Ensure needed keywords are set
IF NOT KEYWORD_SET(psres) THEN psres=120.
IF NOT KEYWORD_SET(color) THEN color=0

; Get the image header
KIh=gethd(headbytes)

; display image sequence number
ext=STRING(KIh.misc.sequence,FORMAT='(I3.3)')
IF KEYWORD_SET(camfilt) THEN $
    ext=STRING(KIh.misc.cam,KIh.misc.fw,FORMAT='(2I1)')+':'+ext
XYOUTS,scl(res=psres,llx+1) $
      ,scl(res=psres,lly+image_height-fac*!D.Y_CH_SIZE-1) $
      ,ext $
      ,/DEVICE,ALIGNMENT=0.0,CHARSIZE=fac,COLOR=color,CHARTHICK=fac
; and exposure time
XYOUTS,scl(res=psres,llx+1) $
      ,scl(res=psres,lly+image_height-2*(fac*!D.Y_CH_SIZE+2)) $
      ,STRING(KIh.misc.exp_scale*KIh.exp.exposure/1000. $
             ,FORMAT='(F4.1,1X,"s")') $
      ,/DEVICE,ALIGNMENT=0.0,CHARSIZE=fac,COLOR=color,CHARTHICK=fac
; and image date
IF KEYWORD_SET(date) THEN $
    XYOUTS,scl(res=psres,llx+1) $
          ,scl(res=psres,lly+(fac*!D.Y_CH_SIZE+2)+1) $
	  ,ymd2date(FIX(KIh.misc.dt.year),FIX(KIh.misc.dt.month) $
		   ,FIX(KIh.misc.dt.day),format='d$ n$ y$') $
          ,/DEVICE,ALIGNMENT=0.0,CHARSIZE=fac,COLOR=color,CHARTHICK=fac
; and image time
XYOUTS,scl(res=psres,llx+1) $
      ,scl(res=psres,lly+1) $
      ,STRING(KIh.misc.tm.hour,KIh.misc.tm.minute,KIh.misc.tm.second $
	     ,FORMAT='(2(I2.2,":"),I2.2," UT")') $
      ,/DEVICE,ALIGNMENT=0.0,CHARSIZE=fac,COLOR=color,CHARTHICK=fac
; and maximum displayed Rayleighs
XYOUTS,scl(res=psres,llx+image_width-1) $
      ,scl(res=psres,lly+image_height-fac*!D.Y_CH_SIZE-1) $
      ,STRING(FIX(hival),FORMAT='("< ",I0.0," R")') $
      ,/DEVICE,ALIGNMENT=1.0,CHARSIZE=fac,COLOR=color,CHARTHICK=fac
; and minimum displayed Rayleighs
XYOUTS,scl(res=psres,llx+image_width-1) $
      ,scl(res=psres,lly+1) $
      ,STRING(FIX(loval),FORMAT='("> ",I0.0," R")') $
      ,/DEVICE,ALIGNMENT=1.0,CHARSIZE=fac,COLOR=color,CHARTHICK=fac

; and solar azimuth if desired
IF KEYWORD_SET(sun) THEN BEGIN
    sunazel,KIH.misc.dt.year,KIh.misc.dt.month $
           ,KIH.misc.dt.day,KIh.misc.tm.hour $
           ,KIh.misc.tm.minute,KIh.misc.tm.second $
           ,solaz
    IF KEYWORD_SET(rot) THEN solaz=solaz+rang
    IF solaz EQ 0. THEN sunptr='' ELSE BEGIN
        IF solaz LT 180.  THEN BEGIN
            sunptr='Sun>'
            ENDIF ELSE BEGIN
            sunptr='<Sun'
            solaz=solaz-180.
            ENDELSE
        ENDELSE
    XYOUTS,scl(res=psres,llx+image_width-2.5*fac*!D.X_CH_SIZE-1) $
          ,scl(res=psres,lly+3*fac*!D.Y_CH_SIZE+1) $
          ,sunptr $
          ,/DEVICE,ALIGNMENT=0.5,CHARSIZE=fac,CHARTHICK=fac $
	  ,COLOR=color,ORIENTATION=90-solaz
    ENDIF

; and lunar azimuth if desired
IF KEYWORD_SET(moon) AND NOT KEYWORD_SET(sun) THEN BEGIN
    moonazel,KIH.misc.dt.year,KIh.misc.dt.month $
            ,KIH.misc.dt.day,KIh.misc.tm.hour $
            ,KIh.misc.tm.minute,KIh.misc.tm.second $
            ,lunaz
    IF KEYWORD_SET(rot) THEN lunaz=lunaz+rang
    IF lunaz EQ 0. THEN moonptr='' ELSE BEGIN
        IF lunaz LT 180.  THEN BEGIN
            moonptr='Moon>'
            ENDIF ELSE BEGIN
            moonptr='<Moon'
            lunaz=lunaz-180.
            ENDELSE
        ENDELSE
    XYOUTS,scl(res=psres,llx+image_width-2.5*fac*!D.X_CH_SIZE-1) $
          ,scl(res=psres,lly+3*fac*!D.Y_CH_SIZE+1) $
          ,moonptr $
          ,/DEVICE,ALIGNMENT=0.5,CHARSIZE=fac,CHARTHICK=fac $
	  ,COLOR=color,ORIENTATION=90-lunaz
    ENDIF

RETURN
END