[Sidefx-houdini-list] Film at 16 bit

Mark Alexander malexander at sidefx.com
Fri Mar 7 17:38:13 EST 2008

Both 16b Int and 32b FP are XMMX and SSE optimized. 16b FP is the 
slowest of the bunch, being a format that is not native to the CPU (it 
is pretty much always up-converted to FP32). 16b Int is probably the 
most work, since you have to worry about the white point (setting it 
somewhere around 4000 for really HDR stuff).

However, you can save all your files in 16b FP and force the compositor 
to load them as FP32 files. Edit->Composite Project Settings, "Pixel 
Format" = "32 bit FP" and "File Operators use the Project Pixel Depth by 
Default" = "On". That save disk space and network bandwidth, while 
optimizing performance in COPs by comp'ing everything in 32b FP. You can 
still save out 16b FP files at the end without any problems.


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