[Bf-vfx] Problems and bugs regarding VFX editing in Blender

[Sebastian König]

I'm also using TGA for tracking and fast playback, but Troy finally convinced me that for serious stuff EXR is indeed the way to go. At least for pre-keyed footage like the one from videocopilot.net. TGA seems to use premultiplied alpha (at least it does when I convert it here, using Syntheyes image processor), and that will give you huge problems. 
See this image: https://img.skitch.com/20110926-c5ftct6s78pswy91pma2r3ks71.png 
Same source footage, but one time converted to TGA and one time to EXR. It's obvious the EXR is better because it preserves much more information and leaves more room for grading. Downside is that it takes ages to load, so for playback you might want to prepare 2 versions, one small TGA for viewport, and the EXR for compositing. 

Cheers,

Sebastian



Am 27.09.2011 um 07:38 schrieb Matt Ebb:

> 
> 
> On Tue, Sep 27, 2011 at 3:35 PM, Coen Spoor <jcspoor at planet.nl> wrote:
>  
> -don't use PNG, it may have alpha and look pretty, the compression algorithm makes is horrific for your memory usage
> -decode footage into a tga sequence, larger files but that's what you want, large easy to read files, tga's have from what I can tell almost a 1:1 file size/memory usage ratio
> 
> All formats of the same resolution/bit depth (eg. 8bit vs float) will take up the same amount of space in memory in Blender. What might be slower in the case of PNG etc is decoding it on file read, but that's CPU not memory.
> 
> Matt
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