C----------------------------------------------------------------------
        subroutine ftpi1b(ounit,nvals,incre,chbuff,status)

C       Write an array of Integer*1 bytes to the output FITS file.

        integer nvals,incre,ounit,status,offset
        character*1 chbuff(nvals)

C       ounit   i  fortran unit number
C       nvals   i  number of pixels in the i2vals array
C       incre   i  byte increment between values
C       chbuff  c*1 array of input byte values
C       status  i  output error status

        if (incre .le. 1)then
                call ftpcbf(ounit,nvals,chbuff,status)
        else
C               offset is the number of bytes to move between each value
                offset=incre-1
                call ftpcbo(ounit,1,nvals,offset,chbuff,status)
        end if
        end