<s>
The	O
text-producing	O
systems	O
LaTeX	B-Application
and	O
TeX	B-Application
produce	O
DVI	B-Application
files	O
from	O
files	O
written	O
by	O
the	O
user	O
.	O
</s>
<s>
Those	O
files	O
used	O
to	O
be	O
(	O
and	O
,	O
to	O
a	O
moderate	O
extent	O
,	O
still	O
are	O
)	O
post-processed	O
by	O
a	O
tool	O
called	O
dvips	B-Language
,	O
which	O
converted	O
those	O
DVI	B-Application
files	O
into	O
PostScript	B-Language
files	O
,	O
which	O
are	O
understood	O
by	O
many	O
printers	O
.	O
</s>
<s>
Some	O
older	O
versions	O
of	O
dvips	B-Language
with	O
embedded	O
bitmapped	O
fonts	O
,	O
which	O
represented	O
letters	O
and	O
symbols	O
as	O
pictures	O
at	O
a	O
fixed	O
resolution	O
(	O
for	O
instance	O
,	O
at	O
300	O
dpi	O
)	O
.	O
</s>
<s>
One	O
solution	O
to	O
this	O
problem	O
is	O
to	O
substitute	O
the	O
bitmapped	O
fonts	O
with	O
scalable	O
fonts	O
(	O
known	O
among	O
PostScript	B-Language
users	O
as	O
Type	O
1	O
fonts	O
)	O
.	O
</s>
<s>
To	O
remedy	O
this	O
problem	O
of	O
low	O
quality	O
printing	O
,	O
one	O
can	O
use	O
Heiko	O
Oberdiek	O
's	O
utility	O
called	O
pkfix	B-Application
.	O
</s>
<s>
The	O
input	O
of	O
pkfix	B-Application
is	O
a	O
PostScript	B-Language
file	O
generated	O
by	O
dvips	B-Language
(	O
with	O
versions	O
at	O
5.58	O
or	O
newer	O
)	O
and	O
its	O
output	O
is	O
another	O
PostScript	B-Language
file	O
,	O
this	O
time	O
,	O
with	O
the	O
bitmapped	O
fonts	O
substituted	O
by	O
scalable	O
fonts	O
(	O
if	O
possible	O
)	O
.	O
</s>
<s>
Technically	O
speaking	O
,	O
pkfix	B-Application
is	O
a	O
Perl	B-Language
script	O
which	O
searches	O
the	O
PostScript	B-Language
file	O
for	O
comments	O
on	O
bitmapped	O
PK	O
fonts	O
(	O
introduced	O
by	O
relatively	O
recent	O
dvips	B-Language
versions	O
)	O
,	O
and	O
replaces	O
them	O
with	O
the	O
corresponding	O
Type	O
1	O
fonts	O
.	O
</s>
<s>
Of	O
course	O
,	O
a	O
simpler	O
solution	O
to	O
this	O
problem	O
would	O
be	O
to	O
reprocess	O
the	O
LaTeX/TeX	O
files	O
with	O
recent	O
tools	O
and	O
fonts	O
,	O
but	O
,	O
in	O
most	O
cases	O
,	O
the	O
person	O
that	O
has	O
the	O
given	O
PostScript	B-Language
file	O
is	O
n't	O
the	O
author	O
of	O
the	O
document	O
and	O
does	O
n't	O
have	O
access	O
to	O
the	O
source	O
files	O
(	O
or	O
,	O
worse	O
,	O
the	O
source	O
files	O
may	O
have	O
been	O
lost	O
during	O
the	O
times	O
)	O
.	O
</s>
