[argyllcms] Modifying internal display LUTs
- From: Knut Inge <knutinh@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 27 Oct 2011 19:42:41 +0200
This has recently been brought to my attention. Evidently, some monitors may
be able to change their LUTs even though it is not documented. Does anyone
know links to such discussions anywhere?
So the advantage of doing anything in the display would be that it is
probably 10, 12 or 14 bits with direct access to the panel with a minimum of
quantization in-between. Compared to the (usually) 8-bit quantization that
happens when crossing the DVI link.
But any LUT (especially 3D LUT) can only decrease the gamut, right? The
reason would be to calibrate the behaviour to some standard response. If you
can characterize the GPU buffer -> visible light, it seems that in most
cases one would prefer to give the software color management component full
freedom and full access to the capabilities of your display to do the
optimal mapping from image file to visible light?
Known exceptions:
-limited by 8 bits it makes sense to distribute them nonlineary (aka gamma).
You want to spend most of them close to black.
-For day-to-day use it would make a lot of sense to upload a "perfect" sRGB
correction curve into the display, meaning that non-color-managed
applications would look as good as possible. Ideally, when loading e.g.
photoshop you would want it to upload a new/swap display LUT into something
more "native"
-k
Other related posts:
