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Table Of Contents
13.12 Caches
What is a cache and what caches can a document use when it executes?
A cache is an amount of RAM set aside to hold items that the document references during execution. In the
case of PlanetPress Design and PlanetPress Watch/Server these items are images. The cache improves
performance by providing faster access to images that the document uses more than once.
There are two caches: a host-based cache, and a printer-based cache. You can adjust the sizes of both of
these caches. However, the default cache sizes set for PlanetPress Design are reasonable ones that in most
cases should not require adjustment.
13.12.1 Host-Based Cache
The host-based cache is the cache the document uses when it executes host-based. The size of this cache is
independent of the document, and its size in PlanetPress Design is independent of its size in PlanetPress
Watch/Server. When you execute the document host-based from within either product, the size of the cache
depends on the setting in effect in that product at execution time. In PlanetPress Design you use the Image
cache option in the User Options dialog box to set the size of this cache.
When the document executes host-based in either PlanetPress Design or PlanetPress Watch/Server, it uses
the host-based cache for its image resources, and for the dynamic images it retrieves from the PlanetPress
Design Suite virtual disk. It never uses this cache for dynamic images it retrieves from a folder.
13.12.2 Printer-Based Cache
The printer-based cache is the cache the document uses when it executes printer-based. The size of this
cache depends on the document.
You use the Max form cache option in the Document dialog box to set the size of the printer cache. You can
also use the Max form item option to set the maximum size of any item in the cache.
When the document executes printer-based, it uses the printer-based cache for both image resources and
external images any dynamic images reference.
Related topics:
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)
Guidelines for Optimizing Images (Page 189)
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