[argyllcms] Re: Displays with internal gamut emulation

  • From: adam k <aak1946@xxxxxxxxx>
  • To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
  • Date: Sat, 21 Aug 2010 15:07:52 -0400

If I choose rgb or adobe mode how do I set all gains to 255 255 255?
OSD doesn't give me access to any settings.

Sent from iPhone

On Aug 21, 2010, at 2:31 PM, János, Tóth F. <janos666@xxxxxxxxxx> wrote:

> I think I already gave you every instructions in my older emails. A little 
> summary:
>
> - This is a real Wide Gamut display. You need a spectrophotometer (like 
> ColorMunki, EyeOne Pro) or may be a colorimeter (like the EyeOne Display 2, 
> Spyder x or DTPxx) with a unique correction matrix (specifically created for 
> your given instrument and display combination - averaged "generic" 
> corrections are be better than nothong but far from good) and a software 
> which supports these correction matrices (like iColor Display 3.7 - and 
> nothing else, I think - CalMan and HCFR won't create calibration LUTs and ICC 
> files.).
>
> - I think that ArgyllCMS is the best display calibration software, so I 
> recommend it. The only warning that you should wait a little bit for the new 
> bugfix version. (But the current version is not totally useless either.)
>
> - You should choose one of these display presets: sRGB, AdobeRGB, Standard
>
> *  You should chose the sRGB preset for any kind of "general PC usage"
> ** You should choose the AdobeRGB preset if you are absolutely sure that you 
> need the AdobeRGB gamut (for some specific jobs) but you are unsure about the 
> quality of your software color management system. (8 bit framebuffers vs 12 
> bit hardware 3DLUTs, given software quality, etc.)
> *** If you are absolutely sure that you will work with a software which 
> offers high quality color correction and/so you can benefit from the wider 
> gamut and slightly higher starting contrast ratio and color accuracy, you can 
> choose the Standard mode. (Advanced softwares with high quality color 
> management and professional VGA cards with 10 bit/color framebuffering, or 8 
> bit framebuffers but softwares with high quality dithering, or special needs 
> for wider gamuts, etc.)
>
> - As a last suggestion. You should take a backup photo of your factory OSD 
> and fine tune your RGB Gain settings.
> * Set every Gains to 255 first.
> ** The highest Gain should always remain 255
> *** You may want to set these Gains for the 6500K preset because Standar mode 
> has smooth RGB level graphs.
> **** But you should keep the other settings at 255-255-255 because the 
> emulated modes (sRGB, AdobeRGB) have crossing RGB level graphs, so you can't 
> really optimize your white balance with these Gains. (But the lowering of 
> these Gains will permanently reduce the contrast ratio and the available 
> color shades. So leave it to ArgyllCMS to decide about the best solution with 
> higher accuracy ¤¤¤)
>
> ¤¤¤ I assumed that you have a VGA card with DeepColor support, do you? (HD4+, 
> GTX2xx+, or the equivalent professional SKUs, as I know). But this won't be 
> worse with 8 bit/color connection either (as the levels will always cross 
> each others, and those Gains works with 8 bit values as well...)
>
> ××× But you should check it for yourself. Do a calibration with maximized RGB 
> Gains to see of the LUT curves are crossing each others of not. If they are 
> smooth and theres is no crossing, you should optimize your white balance with 
> the RGB Gains forst. If they cross, you should keep the Gains maximized...
>
>
> I don't have any more ideas yet.
>
> Or may be one: We have the compiled binaries of the A01 firmware image. Is it 
> possible to revers it with a GPGPU software and crack the internal LUTs? :)

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