demo/cfa.cpp bugfix

[Alexey Khudyakov]

Hello.


demo/cfa.cpp contains bug. It writes data in machine byte order but
pgm require most significant byte first.  First patch fixes this
bug. Probably this is not best way to fix it but al least it works for
me.

Second patch sets the maximum value of pgm pixels to actual maximum
pixel value of image.  I've found it convinient to see something with
imagemagick's display. Without whis patch it shows only black screen.

--
  Regards
  Alexey Khudyakov
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