Re: [Openexr-devel] Query: Image Based Lighting and HDRI-enabled cameras

[Anders Dahnielson]

tis 2003-07-29 klockan 21.23 skrev Brian Willoughby:
> What about pixel depth?  Will we ever see 12 bits per component in an HD 
> camera?

There are 12-bit per component HD cameras. Take a look at Thomson
Filmstream Viper[1] using RGB 4:4:4 10-bit log (the A/D converter are 12
bit linear). The original plan IRC was to use it on Episode III but was
scrapped in favor of Sony's RGB 4:4:4 10 bit log CineAlta system.

 [1] http://www.thomsongrassvalley.com/products/cameras/viper


> I think we have a while before CCDs produce 16-bit half float values (HDRI),  
> but we can probably see something beyond 10-bit soon.  

Remember that 10-bit is integer while 16-bit half is float values. When
someone speak about 10-bit one will always assume that the image data is
in log space. Logarithmic encoding is an efficient compression of color
based upon the principle that the human eye is more sensitive to low-
and mid-tones than to highlights. These highlights can be compressed and
stored using fewer bits than the linear original. 


> I, too, am interested in  
> finding motion cameras which can capture something akin to HDRI,

The DALSA Digital Cinematography[2] camera record 14-bit in 4x2k
resolution.

 [2] http://www.dalsa.com


I'm myself involved in a project building something of a "mini-DALSA"
recording images in 2k resolution and RGB 4:4:4 directly over FireWire.

--
Anders Dahnielson
<address@hidden>

GnuPG 1024D/D424211B 8FDC 38E7 D8E9 67AE 85F4  F2A1 D71D 7FCE D424 211B

"SYNTAX?  Why not - They tax everything else!"

signature.asc
Description: PGP signature