UM:Application Preferences Rendering

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The Rendering preference tab configures global settings used as defaults for various render parameters.

DPX Export Style


The default DPX image format used for DPX exports.


Values :

Big endian, Little endian

Default :

Big endian


Big endian ("cineon" format)
Little endian ("OpenGL" format)



A big endian DPX file has header magic SDPX (ascii). A little endian DPX file has header magic XPDS (ascii). This specifies the byte-order used in the file and has an impact on DPX compatibility. The default should be most compatible.

DPX Export Colour Depth



This specifies the default bit depth and colour data format for exported DPX image files.


Current colour depth RGB - default. This sets the export bit-depth per channel as per the current output format, and uses RGB colour space.
12 bit RGB - use 12 bits per channel, RGB.
10 bit YUV - use 10 bits per channel, YUV.



Leave this at the default setting unless you are sure you need to change it.

Render Tile/Frame Threads



These settings control how many frames we try to render in parallel, and how each frame may be split for further concurrency in the render process.


Render tile threads - this defines how each individual frame is split (tiled) for rendering in parallel across multiple CPU cores
Render frame threads - this defines how many whole frames are rendered in parallel.



These settings are dependent on the system type. See the Install and Configuration Guide for configuration settings for various supported systems.

Image Memory



This setting defines a "pool" of memory the application will allocate for storing and rendering image sequences.



Leave this at the default setting unless instructed to change it by a Digital Vision engineer.

Cache Rendering Setup



These parameters setup some options on how cache renders are generated.

Cache preallocation frames

Values :

text entry

Default :



This defines how many frames are preallocated for caches before the caches themselves are written to disk. This will help prevent caches getting fragmented.



To disable cache preallocation, set to 0 (zero).

Cache fragmentation test

Default :




This test is for Windows NTFS only. Do not enable on SAN filesystems (e.g. Stornext SNFS).


If turned off, caches will not be tested for fragmentation and no fragmentation status will be displayed on the timeline.



Fragmented cache files are displayed in bright-red on the timeline :




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