re: graphics

[Shlomo Perets <shlomo2 -at- microtype -dot- com>]

Some additional points related to JPEGs, screen captures and display 
quality in PDFs:

* One may use a format other than JPEG in the source file, yet JPEG 
compression may be applied to the image data as part of the conversion to 
PDF (eg Distiller compression, when set to "Automatic").

* Likewise, an otherwise high-quality screen capture used in the source 
file may be degraded during the conversion to PDF due to downsampling

* Resizing a screen capture inevitably causes image distortion. Changing 
the zoom level when displaying a PDF effectively resizes the screen capture.
For an optimal display of bitmaps, a separate PDF ("image viewer") may be 
used, with a controlled default zoom level that is related to the dpi value 
in the authoring application. 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).

* JPEGs can be used in a controlled way without loss of quality.
A sample PDF with linked JPEG screen captures (captured with SnagIt), 
displayed in a floating window, is available at: 
http://www.microtype.com/showcase/MultimediaAsst/LinkedJPEG.pdf (76K, 
Acrobat/Reader 6 or higher required)


Shlomo Perets

MicroType, http://www.microtype.com
Training, consulting & add-ons: FrameMaker, Structured FM and Acrobat


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