C++*********************************************************************
C
C  BLANK.F
C
C **********************************************************************
C=* FROM: SPIDER - MODULAR IMAGE PROCESSING SYSTEM.   AUTHOR: J.FRANK  *
C=* Copyright (C) 1985-2005  Health Research Inc.                      *
C=*                                                                    *
C=* HEALTH RESEARCH INCORPORATED (HRI),                                *   
C=* ONE UNIVERSITY PLACE, RENSSELAER, NY 12144-3455.                   *
C=*                                                                    *
C=* Email:  spider@wadsworth.org                                       *
C=*                                                                    *
C=* This program is free software; you can redistribute it and/or      *
C=* modify it under the terms of the GNU General Public License as     *
C=* published by the Free Software Foundation; either version 2 of the *
C=* License, or (at your option) any later version.                    *
C=*                                                                    *
C=* This program is distributed in the hope that it will be useful,    *
C=* but WITHOUT ANY WARRANTY; without even the implied warranty of     *
C=* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
C=* General Public License for more details.                           *
C=*                                                                    *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program; if not, write to the                      *
C=* Free Software Foundation, Inc.,                                    *
C=* 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.      *
C=*                                                                    *
C **********************************************************************
C
C      BLANK(LUN,NSAM,NROW,B)
C
C      THIS SUBROUTINE CREATES A CONSTANT PICTURE WITH A GIVEN
C      BACKGROUND VALUE.
C
C      PARAMETERS:
C        LUN          LOGICAL UNIT NUMBER OF OUTPUT PICTURE
C        NSAM,NROW    DIMENSIONS OF OUTPUT PICTURE
C        B            BACKGROUND CONSTANT TO BE USED
C
C--********************************************************************

        SUBROUTINE BLANK(LUN,NSAM,NROW,NSLICE,B)

        DIMENSION BUF(NSAM)

	BUF = B
        DO  I = 1,NROW*NSLICE
	   CALL WRTLIN(LUN,BUF,NSAM,I)
        ENDDO
        END