IIF/ACES colorspace for video?
IIF/ACES colorspace for video?
- Subject: IIF/ACES colorspace for video?
- From: Dennis Dunbar <email@hidden>
- Date: Thu, 26 Jan 2012 14:44:03 -0800
I just heard about a new color space being adopted in the video world
and wondered if anyone here knew about this and could explain a bit
more about how it might fit in with the more standard color management
practices we've used in the stills world for so long.
Here's a clip from an email sent to me by Thomas Wall giving a brief
explanation:
"The ACES standard color space and the Image Interchange Framework
that the Academy of Motion Picture Arts & Sciences has developed, and
that is being adopted by SMPTE (among others), is almost unknown among
photographers.
This color space and interchange format will increasingly become the
standard way of transferring files and archiving data in the motion
picture and CGI industries. Photographers should also be using this
format for the same reasons they do. The color space encompasses the
entire visible spectrum, the entire CIE tri-stimulus gamut of human
vision, and then some – wide enough to hold data from every
foreseeable camera sensor and display technology without data loss due
to out-of-gamut color coordinates. ACES is a linear color space;
there is no baked-in gamma. It therefore matches the physical nature
of light, the way that light sensors actually record it, and the way
that computer graphics rendering is done. (Gamma adjustments are done
as part of the output transforms for specific devices.) It is stored
in floating point format, not as integers, and therefore has a dynamic
range that goes from black to almost the intensity of the sun. It has
a much more reasonable white point (D60, a standard daylight, and
close to the REC709 white point used for HDTV) than ProPhoto RGB, and
is larger than that color space.
This color space, and the physics and logic behind it, are what we
should be using these days; and products like LightRoom and CaptureOne
should be able to produce and use it directly. We need to move beyond
the dark ages of color management and image interchange standards.
Whatever pressure we or the APA can apply to those software vendors,
we should."
Thanks!
Dennis Dunbar
Blog: http://www.dunbardigital.com/blog/blog.php
Website: http://www.dunbardigital.com
Twitter: http://twitter.com/DennisDunbar
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