On Thursday 01 March 2007 16:25, dcastonia wrote:
> I am using the compression option in PgS (flate), but
for whatever
> reason it does not compress the file. For example, the
PgS file is
> 2.54 megabytes with with one color bitmap graphic. The
PDF version is
> 2.46 megabytes.
comparing the filesize in PgS to the PDF is really an
apples/oranges
comparison.
For example:
Is your image internal or external?
- external images don't count against PgS size
What format is the image in?
- JPG is perhaps the most common offender here. Why?
because it has such a
small file size while retaining a large image size. I can go
into that, but
for now take it as gospel. The small file size allows PgS to
stay small, but
when you go to print the image size becomes apparent. If the
PgS doc is 2.54
megabytes consisting in part of a 2 megabyte JPG that is in
fact a 20
megabyte image then a printed file would be *over* 20 MB.
But you're producing a PDF, not printing, right? Well,
sorta. To my
understanding the way PgS produces a PDF is a cutdown
version of how it
prints to a postscript printer. This makes sense because PDF
is a reduced set
of postscript. However, something like Adobe Acrobat can use
JPG compression
on images which will keep the file size down.
For reference, here are some PgS file sizes and the PDFs
that I made from
them. Note that these PDFs were all made by printing to file
(without
pictures) and then using ps2pdf. Caveats: fonts are
embedded, many (but not
all) images in PgS are external, the PDFs all date to last
December while the
PgS files have all been edited since then.
PgS PDF
3.5M 3.6M
13M 2.5M
15M 6.5M
6.1M 3.3M
Keep in mind that all of this is with the benefit of
compression on text
(which is generally much more compressible than pictures)
and no pictures at
all (excepting possible internal images counting against the
PgS file size
and not against the PDF).
To get a PDF size down I recommend:
1. making sure the DPI is as low as tolerable. Most displays
are about 72 DPI
and even high resolution displays are only around 100 DPI.
2. if possible/practical use a third party application that
specializes in
making PDFs, such as Adobe Acrobat. Adobe Acrobat at least
has extensive
capabilities that allow exacting control over how the PDF is
made.
Tim Doty
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