7.0

13.1 Key Concepts
To add images, you should understand the following key concepts:
• Static and Dynamic Images (Page 168)
• Supported Image Formats (Page 169)
• Image Formats: Bitmapped, Vector, and Metafile Formats (Page 171)
• Resolution (Page 172)
• Color Depth (Page 192)
• Pixel Dimensions (Page 175)
• Image Quality (Page 176)
• Scanline Orientation (Page 352)
• Image Size on the Document Page (Page 179)
• PlanetPress Talk Expressions for Dynamic Images that Reference Image Resources (Page 180)
• PlanetPress Talk Expressions for Dynamic Images that Reference External Images (Page 181)
• Image Name and Pathname Resolution in Dynamic Images (Page 187)
• Caches (Page 188)
• Guidelines for Optimizing Images (Page 189)
• Optimization (Page 190)
13.1.1 Static and Dynamic Images
What are static images and what are dynamic images?
A static image is an image that does not change during document execution. A dynamic image is an image
that changes during document execution. Static images are independent of the input data. Dynamic images
depend on the input data to determine the image file to display. PlanetPress Design supports most image
formats including EPS and PDF formats.Images can be part of the document and can also be considered as
resources within the document.
You create both static and dynamic images using picture objects. In the case of a static image, the picture
object references a single image resource. In the case of a dynamic image, the reference in the picture object
is a PlanetPress Talk expression that resolves to a different image name on each data page.
Image Files for Static and Dynamic Images
The image files for static images are always part of the converted document. You add the images to the
document at design time and PlanetPress Design includes them in the converted document.
The image files for dynamic images may or may not be part of the converted document. If the image files for
a dynamic image are not part of the converted document, the document must retrieve the images at runtime.
In the latter case, you must ensure the images are in a location the document can access at runtime. When
you create the picture object for the dynamic image, in that picture object you specify a PlanetPress Talk
expression that resolves to the pathname of the images you want the dynamic image to reference at runtime.
In most cases you add all of the images a dynamic image references to the document at design time.
How Static and Dynamic Images Work
When you create a static image, in the picture object properties dialog for that static image, in the Image box,
you select one of the image resources in the document.
When you create a dynamic image, instead of selecting an image resource, you enter a PlanetPress Talk
expression in the Image box. The expression references a selection of input data and resolves to the name of
an image. In the case of a dynamic image that references image resources (images internal to the document),
Objectif Lune Inc. © 2009 168