2011

Table Of Contents
Internally, the two key features used to improve playback performance are
tiling and the media cache. The media cache keeps images that have been
loaded close at hand on the local drive for faster retrieval.
To improve playback performance, you can turn on hardware rendering (if
you are compositing with Reaction) and/or define a region of interest. Each
of these has trade-offs (usually between quality and speed) and therefore may
or may not be feasible in a given situation.
Tiling
Images are automatically divided into tiles and processed. Instead of processing
an entire frame, only those tiles that are part of the result of the operation
need processing.
Each tile is 512 by 512 pixels. The number of tiles loaded in the Player at any
point depends on the resolution of the image, the zoom level of the Player,
and the region of interest, if one is definedsee Region of Interest on page
194:
In general, a zoom level that displays only a detail of the complete image
requires fewer tiles than a zoom level that displays the complete image.
For example, if you zoom in so that the Player displays only the top-left
corner of the frame, it loads only the tiles needed to display that area of
the frame. Note that the resolution optimization performed during zooms
may have an influence on the number of tilessee
Resolution on page 193.
A region of interest that contains only part of the image, requires fewer
tiles than a larger one or than the complete image. Only the tiles that are
part of the region of interest are loaded. You can set the Player to show or
hide the area of the loaded tiles that falls outside the region of interestsee
Showing or Hiding Tiles on page 204.
Resolution
You can set the resolution that a Player view or the fullscreen Player usessee
Setting the Resolution for a Player on page 201. When full resolution is not
required, working at less than full resolution can improve playback
performance.
When you change the resolution of a Player, a new copy of the image is
retrieved and added to the media cache at the new resolution and tiled for
that resolution.
NOTE When you zoom out in the Player, the resolution is automatically adjusted
to the optimal one for that zoom level. This reduces the load on the computer.
Playback Performance | 193