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FWG99
Inspiring
November 6, 2016
Question

Graphics cards with Dual LUT capability

  • November 6, 2016
  • 2 replies
  • 2071 views

I am trying to find a graphics card which will support dual LUT's so that I can colour calibrate two different monitors to use with PS editing. Half of the card manufactures do not know if their cards will support dual LUT's which is a bit of a worry! The chip manufacturers ( Nvidia et al ) all say that their chips will support dual LUT's IF the card manufacturer has the correct drivers which isn't much help. Is there anyone out in the PS world who actually has a GC which does support Dual LUT's and if so what is it? My system is Win 10 with a 6-core AMD processor and 32Gb RAM all in a full size tower so the basic system is more than enough but the weak link is the lack of a decent GC. I do not play games so this is for serious photo editing - hence the need to match my two monitors.

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    2 replies

    davescm
    Community Expert
    davescmCommunity Expert
    Community Expert
    November 6, 2016

    I have an AMD HD7970 DC2 3GD5 running triple monitors each with its own LUT. I don't think that particular card is still on sale but it is a safe bet that it's replacements will support multiple LUTs
    I use an i1Pro spectro and Argyll CMS to calibrate & profile which does allow the separate naming as described by D.Fosse

    Dave

    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    November 6, 2016

    You can safely assume that all reasonably current cards support dual LUTs.

    Not all calibrators do, however, but this has nothing to do with the GPU. This is a deliberate market-segmenting limitation via the profile naming policy - profiles have external names you can modify, and internal names you can't. If all internal profile names are identical, every profile you make for whatever display, will overwrite the previous one.

    That said, matching two displays of different make and model is not easy. It's not because calibrators are "inaccurate", but more because they react differently to spectral spikes than the eye. The best way to deal with it is to match the white points as closely as you can visually. Just use the OSD controls, and don't worry if you get completely different numbers. That's normal. Then run the calibration, which will linearize response relative to that white point.

    Setting the calibration parameters is always a strictly visual process. The white point should be a visual match to paper white, luminance and color, or as close as you can get. Nevermind the numbers.

      F
      FWG99Author
      Inspiring
      November 7, 2016

      Thanks for your input - I will go ahead and buy a decent card now.

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