comparing pdfs

[luigi scarso <luigi.scarso@gmail.com>]

Maybe stupid
Consider this (you must have cow.pdf in the same dir):

%%test-1.tex
\setupcolors[state=start]
\setupinteraction[state=start]
\starttext
\startfrontmatter
\completecontent
\stopfrontmatter
\startbodymatter
\chapter{Chapter}
\section{Section}
\input tufte
\externalfigure[cow]
\chapter{Chapter 2}
\section{Section}
\input knuth
\stopbodymatter
\stoptext

with markii
$>texexec --pdf test-1.tex
$>cp test-1.pdf test-1a.pdf
$>texexec --pdf test-1.tex
$>pdftoppm test-1a.pdf  test-1a-
$>pdftoppm test-1.pdf  test-1-
$> cmp test-1a.pdf test-1.pdf
test-1a.pdf test-1.pdf differ: byte 35086, line 220
of course at least /ID is different

$>for j in `seq 1 4`; do cmp test-1a--$j.ppm test-1--$j.ppm ; done
and, again of course, *no differences* because the files are equals page-by-page
-- so they are equals

Is there a way more quick and clean than  for cycle and ppm files?

--
luigi
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