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Subject: Re: [docbook-apps] How to specify out resolution for FO
On Sunday 01 February 2004 11:10, David Tolpin wrote: > > In my experience, it is always easier to prepare production files in such > > a way that they are optimized for the equipment of the print shop doing > > your production. It saves lots of time, both sides, and increases the > > chances of getting production to the state of being a "repeatable > > process". This state is often found in organizations that apply > > engineering processes to their production. > > > > When files are not optimized, any number of tweaks may be required during > > production, theses steps may be forgotten during future print runs. The > > result being inconsistent quality. > > Sean, > > I've looked through PDF specification and generated sample images in > Acrobat Distiller just to confirm. > > The only difference is the way raster images are stored; namely if you have > a high resolution image and target a low resolution device, the image is > scaled down before embedding into PDF. This explains the problem I am experiencing with high res images not retaining their original quality. > > Nothing else. > > And this very functionality is easily achieved with stylesheet parameters, > choosing different images for different resolutions. Moreover, this > solution will give better and more predictable quality. This technique is not giving me the predictable quality level I want. The result is consistant to be sure, but the image quality is reduced. > > > So, as far as I can see, providing you have Acrobat Distiller, the route > > to obtaining PDF with a higher resolution should be something like this: > > > > XML > XSL-FO > PS > [ACROBAT DISTILLER]> PDF > > There is no such thing as PDF with higher resolution. The only difference > is raster images, which are scaled down before inserting for lower > resolutions. > > > how do we get resolution into our PS files? I think we're back to square > > one. > > RenderX XEP provides processing-instructions to embed printer specific > commands into Postscript output. You can use DocBook customization layer to > add as many as you like. OK, now I'm getting somewhere. There are obviously extensions required, of which I have no knowledge. I will try to find the solution in the documents provided with the XEP demo I am currently evaluating. -- Sean Wheller
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