When the PDF is displayed on-screen, zooming in/out will effectively
downsample/upsample the screen capture, causing loss of quality.
For an optimal display of screen captures (and when printing the PDF is not
the primary intended use), a separate PDF ("image viewer") may be used,
with a controlled default zoom level that is related to the dpi value used
in FrameMaker. This default zoom level is restored, if changed, when the
reader switches pages.
For an example, see http://www.microtype.com/showcase/text.pdf
The linked file -- http://www.microtype.com/showcase/screens.pdf -- takes
into account the different display resolution of Acrobat/Reader 5 (and
earlier, 72 dpi) vs. Acrobat/Reader 6 (and later, 96 dpi by default).
If you open the screens.pdf file in Acrobat/Reader 6.0 or higher, it opens
at 75% zoom. Display quality is the same as the original (assuming that
Acrobat's default display resolution of 96 is in effect). When you change
the zoom to 74%, 73%, or 76%, loss of quality is immediately visible
(missing pixels or blurry areas).
Magnification settings such as Fit Page or Fit Width yield unpredictable
zoom levels, and therefore unpredictable display quality of screen captures.
[ Another screen-optimized approach is demonstrated at
http://www.microtype.com/showcase/MultimediaAsst/Jpeg_linked.pdf ]
Shlomo Perets
MicroType, http://www.microtype.com * ToolbarPlus Express for FrameMaker
FrameMaker/Acrobat training & consulting * FrameMaker-to-Acrobat
TimeSavers/Assistants
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