2690WUXi and LUTs (I wish Will from NEC would see this)

Started Oct 16, 2007 | Discussions thread
Carl Robitaille New Member • Posts: 20
Re: 2690WUXi and LUTs (I wish Will from NEC would see this)

Will49 wrote:

Doing gamut mapping in a monitor to make it behave like it has a
different (smaller) gamut than it actually has, requires very
sophisticated 3D LUTs and transforms. Applying these transforms in
the 2690 means that the LUTs are no longer available for use in
calibrating the display with SpectraView.

That's what I don't understand. Is there a paper somewhere that I can read to understand what makes it complicated to do so? Without knowing the internal workings of the programmable LUT and SpectraView II, I think it's safe to say that the LUT is basically a mapping of 2^24 -> 2^36, mapping 8 bits RGB inputs to 12 bits RGB outputs. Since sRGB is essentially (totally?) a subset of aRGB, why can't the LUT be filled with colors matching sRGB (as close as possible of course) and using only a subset of the gamut available? Is it a software limitation like I think it is, or is there something more to it?

If someone really needs to have an calibrated "true" sRGB display, I
would recommend either going for the 2490, or using a standard LCD as
a secondary display for proofing sRGB.

That's what I intend to do. But if the limitation is software, it's a shame that I'll have to "limit" myself and buy a 2490 instead of a 2690, which was my first choice.

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