Using ghostscript 9.05 to create a PDF/A from TIFF
gs->ps->pdf
%gs -d SAFER -dBATCH -dNOPAUSE -dDEVICE=psdrgb -s OutputFile=figure-%d.ps figure.pdf
Notes: use # instead of = when passing parameters to ps2pdf!
%ps2pdf -sPAPERSIZE#a4 file.ps file.pdf
Ghostscrtipt cannot convert TIFF to PS