Cineform support for overbrights at DVinfo.net

Mike Harrington · December 30th, 2010, 12:57 AM

I am rendering out a project from Fusion to the cineform DPX-C (thanks to Axel Mertes for the awesome plugin)

Everything is cool except I have some luminance values way above 1 in Fusion that I need to preserve (to function as a mask later.....it's complicated).... but when they come out of fusion into DPX-C they are truncated at 1 or less.

When I render to EXR the bright values are retained...(actually up to 3 or more)

does Cineform have support for floating point value's above 1 ?
Thanks

David Newman · December 30th, 2010, 10:21 AM

There are not floating point pixel format support (yet), so you need to preserve all your image data in the 0 to 1 range. Think of CineForm like a DPX 10-bit master, that does handle whites above 1023 (10-bit one), yet with a Log curve a white stored a 685, your white extremes can be 4 stops over -- this works fine for CineForm encodes. As the encode and decode can have separate curves (experiment in FirstLight), Axel Mertes plugin could automatically set up a high dynamic range curve for you, that outputs in the display(decode) curve you want.

Mike Harrington · December 30th, 2010, 01:39 PM

ok thanks David...
I see what you mean....I always go linear so I don't think in curves...but I will forward that idea to Axel.

Floating point support would be very cool.....I would love to run my entire pipeline in cineform...but right now still need EXR for it's extra buffer support.....hint...hint
:)

David Newman · December 30th, 2010, 01:43 PM

By extra buffer, do you mean extra channels? Are they are the same resolution as the source, how many extra would be of use?

Mike Harrington · December 30th, 2010, 05:51 PM

ya same resolution....

depth is probably most important to me...followed by objectID, x,y,z motion and normal's
depth would be best implemented floating point...as you can get huge values.
i would jump for joy, if i had a few of these in cineform.

if you guys could develop something with support for these as well as deep compositing support, you would have the holy grail of image formats....you already do in my opinion in the editing/finishing side....

check out Deep Image Compositing In Depth
there is a growing movement for deep images...but currently only proprietary...(usually in house) image formats support it....and due to some limitations in EXR....it currently cannot support it either.
This will be big in a very short time....

December 30th, 2010, 12:57 AM	#1
Mike Harrington Regular Crew Join Date: Jan 2009 Location: Edmonton, Canada Posts: 91	Cineform support for overbrights I am rendering out a project from Fusion to the cineform DPX-C (thanks to Axel Mertes for the awesome plugin) Everything is cool except I have some luminance values way above 1 in Fusion that I need to preserve (to function as a mask later.....it's complicated).... but when they come out of fusion into DPX-C they are truncated at 1 or less. When I render to EXR the bright values are retained...(actually up to 3 or more) does Cineform have support for floating point value's above 1 ? Thanks

December 30th, 2010, 10:21 AM	#2
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	There are not floating point pixel format support (yet), so you need to preserve all your image data in the 0 to 1 range. Think of CineForm like a DPX 10-bit master, that does handle whites above 1023 (10-bit one), yet with a Log curve a white stored a 685, your white extremes can be 4 stops over -- this works fine for CineForm encodes. As the encode and decode can have separate curves (experiment in FirstLight), Axel Mertes plugin could automatically set up a high dynamic range curve for you, that outputs in the display(decode) curve you want. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

December 30th, 2010, 01:43 PM	#4
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	By extra buffer, do you mean extra channels? Are they are the same resolution as the source, how many extra would be of use? __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

December 30th, 2010, 01:39 PM	#3
Mike Harrington Regular Crew Join Date: Jan 2009 Location: Edmonton, Canada Posts: 91	ok thanks David... I see what you mean....I always go linear so I don't think in curves...but I will forward that idea to Axel. Floating point support would be very cool.....I would love to run my entire pipeline in cineform...but right now still need EXR for it's extra buffer support.....hint...hint :)

December 30th, 2010, 05:51 PM	#5
Mike Harrington Regular Crew Join Date: Jan 2009 Location: Edmonton, Canada Posts: 91	ya same resolution.... depth is probably most important to me...followed by objectID, x,y,z motion and normal's depth would be best implemented floating point...as you can get huge values. i would jump for joy, if i had a few of these in cineform. if you guys could develop something with support for these as well as deep compositing support, you would have the holy grail of image formats....you already do in my opinion in the editing/finishing side.... check out Deep Image Compositing In Depth there is a growing movement for deep images...but currently only proprietary...(usually in house) image formats support it....and due to some limitations in EXR....it currently cannot support it either. This will be big in a very short time....