No Alpha channel in DPX files
Posted: Thu Nov 30, 2017 9:21 pm
look at saver in comp window, alpha is good. alpha is enabled in saver. opened rendered files, NO ALPHA ! setting was 10bit if that matters...
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https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=22&t=67416
Bryan Ray wrote:10 bit DPX export doesn't permit alpha, but 12-bit does. Of course, 12-bit limits the systems that can import the files (Fusion 7 can't do it, for instance).
I don't know if that's a limitation of the spec or just Fusion's implementation.
Suchuāto Ritoru wrote:What does it matter whether it's efficient or not?
Bryan Ray wrote:Suchuāto Ritoru wrote:What does it matter whether it's efficient or not?
It matters a lot. Transfer time, storage space, necessary network bandwidth, human time waiting for transfers and uploads. All of these things cost money. Sometimes a lot of money. It's one thing to transfer 8 MB frames when they're actual artwork. It's quite another when they're mattes that could be 10k with no loss of quality or utility.
Chad Capeland wrote:I can't think of a more inefficient system of handling mattes than to use a 10 bit RGB uncompressed raster. I know it's standard, but it's still terrible.