[Tig] Why isn't HDR(-like) rendering more widespread?

Dan C. Tatut dtatut
Wed Mar 29 23:56:01 BST 2006


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Thanks to oktobor for supporting the TIG
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Yes Glenn,

and it is even more important when secondary color corrections come into play... especially when animating extreme color corrections. If you use only LUT (1D/3D) based, clipping occurs and you loose precision. Also when combining several secondary without 32-bit float precision, in 8 bit or 10bit will quickly result in loss of quality...

Dan Tatut
CEO
CHROME Imaging
105 Rue de Lyon
CH-1203 Geneva
Switzerland

Phone: +41 22 807 23 60
Fax: +41 22 807 23 70
Mobile: +41 78 659 11 04
WWW: http://www.chrome-imaging.com


-----Original Message-----
From: glenn chan [mailto:glennchan at gmail.com]
Sent: jeudi, 30. mars 2006 00:47
To: tig at tig.colorist.org
Subject: Re: [Tig] Why isn't HDR(-like) rendering more widespread?


--
Thanks to oktobor for supporting the TIG
--
Even with 8-bit and 10-bit origination (and storage), you would see
differences in HDR versus not HDR as my Wiki page demonstrates.

i.e. The footage comes in as 8-bit with gamma
compression/companding/correction (i.e. DV/firewire, SDI, etc.).  Expand
that out by taking all the values to an exponent of ~2.2 (ignoring the whole
601/709 issue for now).  Do the saturation algorithm.  Put the gamma
correction back in.
A lot of programs are moving towards processing in 32-bit float anyways.
Removing and putting the gamma correction back in is just an additional
step.

Glenn Chan
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