Re: large images / EPSI

In article <slrne4k5p1.csr.BZ@xxxxxxxxxxxxxxxxxxxxxxxx>,
BZ <BZ@xxxxxxxxxxxxx> wrote:
blmblm@xxxxxxxxxxxxx wrote in comp.text.tex:
Please make one of the PS files available on the net. The suggestion of
others to convert to jpeg and then back to ps (that is rasterizing the
graphics) is the very last resort, first you should try to get decent
vector eps.

Example at http://www.cs.trinity.edu/~mlewis/Rings/vwinbow/.

I've been playing a bit with this example file. It seems the the
suggestion of simply converting it to a real bitmap format is best
(and specifically Piet's suggestion of using Imagemagick with the EPS2
output format).

As I just noted in a reply to another poster (the one who suggested
postprocessing with an awk script) .... Doesn't converting to a bitmap
commit one to a particular resolution? i.e., make it impossible to
scale the resulting image?

The command "convert Fig3.1.ps EPS2:test.eps" converts the original
316MB postscript file to a 517kB (bitmapped) eps (on my linux system).
The bitmap is perhaps a bit on the small side (612x792), but that
should easily be solved by using the right option of the convert
command.

"The right option of the convert command", right .... Okay, a
Google search for "imagemagick" and "eps2" finally pointed me to
appropriate documentation (somehow I didn't find it in the man
page or in a previous cursory look at the referenced Web site,
http://www.imagemagick.org).

It's not obvious to me, though, why converting to EPS2 (which the
documentatation just describes as "Encapsulated Postcript, level 2")
would create a bitmap? and why this would be preferable to other
output formats, such as JPEG or PNG? granted those aren't useful
for processing with latex/dvips, but it seems that pdflatex can
deal with them.

I'm pretty sure, by the way, that higher resolution would be needed;
when I view the 517K EPS, the captions look a bit ragged, and I *think*
(though I'm not 100% sure) that some of the fine detail in the part
of the plot that on first inspection looks like solid gray might be
getting lost. Presumably one could choose higher resolution, and
that might solve these problems.

But a "thank you" to you and all who are contributing ideas. Lots
of things to try, and it's taking a little time to try them all,
but for the record/archives I'm trying to report back on how well
they work ....

--
| B. L. Massingill
| ObDisclaimer: I don't speak for my employers; they return the favor.
.

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