cineSpace, A THX Technology. The Post Production Industry Standard for Colour Correction (1 Viewer)

[Gregg Loewen]

Hi guys Im attending a 2 day training class in NYC right now on Colour Science and cineSpace software / colour management. More info to come. Has anybody else heard of cineSpace ?

 

[elwaylite]

I have not, but can't wait to hear.

 

[Gregg Loewen]

this class was awesome from a color science standpoint! One of the big take aways from the class is coupled vs decoupled. A reference display should decouple when it is set to rec 709, which means all luminance levels for RGB should be properly adjusted and in gamut. This is a problem we see all the time in the home theater space, we use CMS controls to nail rec 709 at 75% stimulus but the image still looks incorrect. This is called coupling and can only be properly corrected by applying a 3D LUT.

 

[GeorgeAB]

this class was awesome from a color science standpoint! One of the big take aways from the class is coupled vs decoupled. A reference display should decouple when it is set to rec 709, which means all luminance levels for RGB should be properly adjusted and in gamut. This is a problem we see all the time in the home theater space, we use CMS controls to nail rec 709 at 75% stimulus but the image still looks incorrect. This is called coupling and can only be properly corrected by applying a 3D LUT.

Please define "3D LUT."

 

[Gregg Loewen]

Hi Alan LUT refers to "look up table". You can have 1D or 3D LUTs. D refers to dimension. Think of a displays white balance, gamma, and CMS controls as a 1D LUT, where you measure at 75% stimulus and make the display conform to rec 709. The problem with this is that the display also needs to apply the same corrections to all other values to make the display look correct. Some examples of displays that do not correctly apply this correction are the VT30s in mid and high output, and various Mitsubishi DLPs. A display that does not apply the correct corrections are called coupled. A coupled display will require a 3D LUT. Think 3 dimensional, where not only the 75% stimulus values are manipulated, but also each gamma point of the RGB chroma channels, then in addition (depending on need), many other (up to 1000) points within the 3D volume of the color gamut. Gregg

 

[Sam Posten]

Dude, if they can't even spell color right why should we trust those eeeeenglish fools with our TVs? =) Oh wait, this was in NYC not London? Crazy!

 

[GeorgeAB]

Hi Alan LUT refers to "look up table". You can have 1D or 3D LUTs. D refers to dimension. Think of a display's white balance, gamma, and CMS controls as a 1D LUT, where you measure at 75% stimulus and make the display conform to rec 709. The problem with this is that the display also needs to apply the same corrections to all other values to make the display look correct. Some examples of displays that do not correctly apply this correction are the VT30s in mid and high output, and various Mitsubishi DLPs. A display that does not apply the correct corrections are called coupled. A coupled display will require a 3D LUT. Think 3 dimensional, where not only the 75% stimulus values are manipulated, but also each gamma point of the RGB chroma channels, then in addition (depending on need), many other (up to 1000) points within the 3D volume of the color gamut. Gregg

The next obvious question would be, "Are there any consumer displays that incorporate 3D LUT capability?" If not, can this capability be provided by an outboard processor, and what is available on the market?

 

[Gregg Loewen]

Hi Alan no, not yet. 3D LUT application is an emerging technology in the consumer market. (Stay tuned).

 

[Joel Barsotti]

The only thing that is vaguely consumer oriented at this point that I know of with a 3D Lut is the eeColor Box http://www.eecolor.com/eecolortech.htm The real trick is actually calibrating the 3d LUT. CalMAN supports the 2D Lut on the eeColor box now, but we aren't manipulating the 3D one at this time.

 

[Gregg Loewen]

hey Alan Here is a link to an excellent 1 hour webinar on LUT creation and color science: http://www.thx.com/professional/thx-technology-professional/thx-color-science/thx-color-management-101-webinar/ This webinar is the first in a series. I will post others as they become available.

 

[Light Illusion]

Another place for info on LUTs is: www.lightillusion.com/luts.html And LightSpace CMS has grown to become the most widely used colour management system within the past few years. Worth a look - but then I would say that We obviously manufacture the LightSpace CMS system. Oh, and LightSpace CMS can make LUTs for just about every system ot there that can use LUTs, including the eeColor box. Cheers, Steve Steve Shaw LIGHT ILLUSION [email protected] +44 (0)7765 400 908 www.lightillusion.com Skype: shaw.clan THE ART & SCIENCE OF DIGITAL IMAGING