RosettaCodeData/Task/Bitmap-PPM-conversion-through-a-pipe/Zkl/bitmap-ppm-conversion-through-a-pipe.zkl

img:=PPM.readPPMFile("fractal.ppm");
p:=System.popen(0'|convert ppm:- jpg:"fractal.jpg"|,"w");
img.write(p); p.close();