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Re: [TeXmacs] Strange artifacts on PNG image


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  • From: Sam Liddicott <address@hidden>
  • To: address@hidden
  • Subject: Re: [TeXmacs] Strange artifacts on PNG image
  • Date: Mon, 27 Feb 2012 17:59:41 +0000
  • Authentication-results: mr.google.com; spf=pass (google.com: domain of address@hidden designates 10.182.86.201 as permitted sender) smtp.mail=address@hidden
My guess is that you are using ghostscript 9.x

They changed the ps2write target to convert a bitmap into a series of vector draws - I think so that colour space mapping would work on the bitmap. It has the side effect of making the generated post-script enourmous and also slow to generate and slow to render.

I rasied this with the ghostscript guys who mentioned that they would add an ep2swrite target in the future that did not do this, but that until then, we were stuck (and basically it serves us right for mis-using the ps2write target).

For me the fix was to use imagemagick to process embedded bitmaps into ps, or use qt_image_to_eps and process the generated ps with ps2ps

You'll find more info on the thread here, along with a patch: 
http://lists.gnu.org/archive/html/texmacs-dev/2011-05/msg00000.html

Maybe now, ghostscript has an ep2swrite target; but it will be an error to use the ps2write target on ghostscript > 9.x as I explain.

Sam

2012/2/27 François-Xavier Thomas <address@hidden>
Hi all,

Another issue just popped up, except I'm not sure whether this is my fault or a real bug.
I have a PNG file I'd like to add in a document, and it looks fine in TeXmacs, but as soon as I generate the PDF, a lot of artifacts appear. Links to TM and PDF files are below.

I'm using Mac OS X 10.7 with a handmade Homebrew formula for TeXmacs, so it may be my fault. I'm guessing it might be a badly configured ImageMagick, but I'm not sure. How does TeXmacs integrate an image into a document, exactly (i.e. what kind of conversion, file formats, ...)?

Had anyone heard about this before, or does anyone know a fix?

Thanks for your time!

TM file : http://db.tt/N3pAVDeF
Resulting PDF file : http://db.tt/U3oixWmP

François-Xavier Thomas

PS : You might notice a lot of messages from me, since I recently switched to a small MBA for taking notes in class (instead of my bulky old Dell), and I'm starting to use this computer for more advanced documents as well. It's not as flawless as on Linux, though... Anyway, cheers to the devs, TeXmacs is far superior to any other mathematical editing software, so keep it up!


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