Scale

Try it.

%!
% Example of scaled image (text)

/Times-Roman findfont 40 scalefont setfont

gsave
  72 72 moveto
  0.5 1 scale           % Make the text narrow
  (Narrow Text) show    % Draw it
grestore

gsave
  72 144 moveto
  1 2 scale             % Make the text tall
  (Tall Text) show      % Draw it
grestore

gsave
  72 216 moveto
  2 0.5 scale           % Make the text wide and short
  (Squeezed Text) show  % Draw it
grestore

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