I have to admit to being curious about this discussion as image quality has never been an issue for me (if it matters: FM9, all patched on Windows 7).
I use only EPS files or, if I need to insert arrows or other highlighted options on an image, I use a TIF or PNG inside a Visio file which I then save to PDF. All images are imported by reference. (I *very* seldom scale a PDF after importing it and if I do, I try to keep it within a few percentage points of 100%.) I create my final PDFs twice from the same book setup with different joboption files so I get a digital version for viewing and a press quality one for printing on a professional, 600 dpi, high-speed, colour laser (with/without links and lower/higher image downsample settings are the major differences). Both of these options result in good, onscreen image quality at reasonable zoom levels (if you're going to zoom to 600% or 1000%, you get what you get). I have to plead major ignorance in the field of images, so how did I luck into a reliable method which I devised after a little trial and error? Alison -----Original Message----- From: framers-bounces at lists.frameusers.com [mailto:[email protected]] On Behalf Of Shlomo Perets Sent: March 25, 2011 3:04 AM To: framers at lists.frameusers.com Subject: Re: DPI Recommendation for Images Alan Litchfield wrote: >... There is no value that I see in trying to dictate to the reader what >they will see at any specified zoom. The reader will decide what is >`good enough' for their viewing pleasure. ... Forcing a specific zoom (related to the DPI value at which the screen captures are placed in FM) is indeed not practical, especially since readers can easily switch between view settings of Fit Page, Fit Width etc. (that result in different zoom levels in different computers/screens). However, this variable zoom effectively guarantees that the rendering of screen captures will be suboptimal, with different levels of distortion (missing pixels and/or blurred display). This is not a problem when the PDF is primarily intended for print purposes, but many PDFs are primarily used on-screen (even when the intended use is print, e.g. to benefit from interactivity/search). No easy solutions, unfortunately. Displaying the screen capture without any distortion is possible through "off-page" display -- see different examples at http://www.microtype.com/ImprovePDF29.html . [ The same issue applies directly to the display of SWF screen movies (where FM8/9/10 only support in-document placement; distortion of movie display in the PDF is practically guaranteed), see comparison of playback modes at http://www.microtype.com/showcase/MultimediaAsst/PlaybackModes.pdf or http://www.microtype.com/showcase/MultimediaAsst/PlaybackModes-Native.pdf , Acrobat/Reader 9 or higher ] Shlomo Perets MicroType, http://www.microtype.com FrameMaker/TCS training & consulting * FM-to-Acrobat TimeSavers/Assistants _______________________________________________ You are currently subscribed to framers as alison.craig at ultrasonix.com. Send list messages to framers at lists.frameusers.com. To unsubscribe send a blank email to framers-unsubscribe at lists.frameusers.com or visit http://lists.frameusers.com/mailman/options/framers/alison.craig%40ultrasonix.com Send administrative questions to listadmin at frameusers.com. Visit http://www.frameusers.com/ for more resources and info.
