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Subject: Re: [docbook-apps] excluding image format according to output
Hi Paul. (Are you from a publishing background by any chance?) On Mon, 2005-04-18 at 00:01 +0930, Paul A. Hoadley wrote: > > So down to vector images, on fo output? > > For images like line drawings and diagrams, I'd have to say yes. But > I suppose you also need to consider the intended use of the final > document. If you're publishing a lecture hand-out, a PNG or GIF might > be perfectly acceptable, particularly if it has not been scaled. If > you're intending to print a book, you would need to use a vector > format. > > > This does narrow down doesn't it! Is SVG the only viable vector > > format for HTML then? Still restricted to a browser plug in. > > As far as I know, yes. At least its nice and simple. > > > > If the output format can handle it, you are certainly better off > > > using a vector format for the image (EPS, SVG, PDF). > > > > Again showing my ignorance. EPS I knew of, SVG I'm OK with, but PDF > > for an image? > > Sure. PDF is just a page description language, after all. XEP, for > example, can include PDF images in a PDF just using the > fo:external-graphic element. Think including EPS in PS. <grin/> I never did Paul, honest. Before my time!!! More to the point, I don't know how! > > > What tools are used to generate them please? > > I have actually never used Adobe Illustrator, but I'd be surprised if > you couldn't output a drawing directly as a PDF. XFig will export as > PDF. Failing that, save your image from your favourite vector drawing > program as EPS and use ps2pdf to convert. I'd never contemplated anything.pdf as a simple image. Document with embedded image perhaps... Is this what people do? > > PNG isn't a vector format though Paul... is it? > > No, it's not. I probably wasn't completely clear there. Say that you > know your final output needs to be 2 inches square on a 600x600 DPI > printer. You need a 1200x1200 image. You could create an EPS > version, and on output it would be rasterised to a 1200x1200 bitmap > for printing. Theoretically, you could produce _exactly the same_ > bitmap as a PNG. But if you did that, and later needed to put it in a > 4 inch square region, the scaled result will look blocky. The EPS > image will be re-rasterised to 2400x2400 bitmap with no loss of > quality. Now you're complicating matters Paul. Come on docbook-ers, how do *you* generate your images for hi-Q output in pdf? Generate the image in eps, at a fixed pixel size, for the target image space?? Sounds very inky sleeves to me, down the typesetters with you Paul :-) My (apparently very simple) world,says I have an image. I want to publish it in (html|pdf). Let Bob and Norm look after it with the xslt. Am I being too simple again? What do other people do? regards DaveP
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