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Subject: Re: DOCBOOK-APPS: Problem converting DB to PDF...
On Tue, Feb 20, 2001 at 04:04:27AM -0500, Adam Di Carlo wrote: > I have an unreleased but I think pretty decent system, 'preheat'. > This is a scheme-based system. You specify a little scheme file with > the local stuff to build and customization, for instance: Oh God. Just as soon as I think I've cleared some free time, something new and interesting comes along. :-) We should really try and get together at some point and go through this stuff in more detail. I get the feeling there are several groups all working towards similar goals, and there are just too many mailing lists to keep track of. > Anyhow, Nik, your system looks good -- good enough to go through and > cull ideas from. There's one change I had to make to the description I posted. In FreeBSD you now (or will have to very shortly, when I commit it) write something like <imagedata fileref="figure1" format="PNG"> or '... format="EPS"', depending on the *source* format of the image. You still only have one ImageData element per image, but you have to specify the format. Why? I discovered that if I convert PNG images to EPS files and then run them through TeX they appear about twice the size they should do. For example, an 80x24 xterm takes up almost half the page. Scaling the images works, but then you have a problem. Image Format Output Format PNG EPS HTML Native format, looks OK Is converted to PNG using png2eps, looks OK Postscript Is converted to EPS, needs scaling by 50% Native format, looks OK PDF Native format, needs scaling by 50% Is converted to PDF, looks OK The PNG images are the problem. You need to scale them in the Postscript and PDF case. You can do this in one of two ways: 1. Write <imagedata fileref="figure1" scale="50"> in your document. The problem with this is HTML images will be scaled, and so will the EPS and PDF images. So then you have to create all your EPS images twice the size they need to be, *and* scale them all by 50% when you convert EPS to PNG. Unacceptable. 2. Update the stylesheet to scale all images by 50% if the scale attribute is not set. Less work for the author, but has the other problems that (1) has. Neither of these are acceptable. So, my third solution was to mandate the use of the 'format' attribute. But we use to specify what the original image format was. So if you have a PNG image, you write <imagedata filereg="figure1" format="PNG"> Then redefine the Graphic handling in the stylesheet, like so; (define ($graphic$ fileref #!optional (display #f) (format #f) (scale #f) (align #f)) (let* ((graphic-format (if format format "")) (graphic-scale (if scale (/ (string->number scale) 100) (if (and tex-backend (equal? graphic-format "PNG")) 0.5 1))) (graphic-align (cond ((equal? align (normalize "center")) 'center) ((equal? align (normalize "right")) 'end) (else 'start)))) (make external-graphic entity-system-id: (graphic-file fileref) notation-system-id: graphic-format scale: graphic-scale display?: display display-alignment: graphic-align))) which automatically scales the image by 50% if the following holds 1. The author didn't specify a "scale" attribute themselves. 2. tex-backend is #t 3. The "format" attribute is "PNG" A kludge, but it works. > > I fetched the above mentioned FreeBSD Makefiles and adapted them > > especially to Debian/GNU Linux (pathnames, etc.). Up to now there is no > > additional documentation except the .mk files itself - and the original > > posting of Nik of course! > > > > You will find a tarball at: http://www.miwie.org/docbkmake/ > > > > Feedback is welcome :-) > > FYI, freebsd.dsl is already shipped on debian systems, in the > docbook-stylesheets package. Ah, I didn't know that. What's the best way to make sure that you guys are informed when changes are committed? N -- Internet connection, $19.95 a month. Computer, $799.95. Modem, $149.95. Telephone line, $24.95 a month. Software, free. USENET transmission, hundreds if not thousands of dollars. Thinking before posting, priceless. Somethings in life you can't buy. For everything else, there's MasterCard. -- Graham Reed, in the Scary Devil Monastery
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