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Variable:
Argument:
Enable thumbnail caching. This is good for a 5X reduction in processing time when a single image is added or removed from a directory since thumbnails are cached in reduced form.
As an added benefit, WebMagick can share its cache with John
Bradley's xv
image manipulation program (Visual Schnauzer
feature) if configuration values are set as follows:
$opt_cacheformat= 'P7'; $opt_cachegeom = 80x60; $opt_cachedir = '.xvpics';
Sharing the cache with xv
is only feasable if all of the
images being cached are compatable with xv
(ImageMagick
supports many more formats than xv
). A further drawback of
sharing the cache with xv
is that xv
is limited to
thumbnails with a geometry of 80x60 which may be small for your tastes
(I prefer larger).
Variable:
Argument:
Specify subdirectory name to cache thumbnails in (default `.cache').
Variable:
Argument:
Specify the format that cached thumbnails are saved in. Can be any format that ImageMagick knows how to read and write. The default is 'JPEG' which works well for photorealistic images.
Variable:
Argument:
Specifies the geometry specification for cached thumbnails. The default
is to use the value specified by $opt_thumbgeometry
(see section Thumbnail Geometry). If a smaller value is used, there will be more unused space
around the montaged thumbnails. Use of a larger value than the thubnail
geometry is to be avoided because the cached thumbnail will still have
to be reduced for the montage, costing both time and thumbnail quality.
Variable:
Argument:
Specifies the original Image size (in total pixels) over which caching will be used. For images smaller than this size, WebMagick will use the original image in the Montage and no thumbnail will be cached. The default value is 60,000 which is equivalent to a 300 x 200 image.
Selecting a value for this option is a judgement call based on space vs time. If a small value is selected, the initial run will be slower and more disk space will be consumed by thumbnails. However, subsequent updates should be faster since more thumbnails are already reduced. If a large value is selected, then less disk space will be consumed, the first pass will be faster, and subsequent passes will be slower.
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