[argyllcms] Re: Percentage gamut measurements

  • From: adam k <aak1946@xxxxxxxxx>
  • To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 13 Apr 2010 21:47:27 -0400

I just made curves&matrix profile and it appears to be bad when I run
profile verification. Much worse than LUT.

Sent by AAK from iPhone 3Gs

On Apr 13, 2010, at 1:21 PM, Steffen <mail@xxxxxxxxxxxxxx> wrote:

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> For monitors, matrix+curves is most appropriate. This is for two
> reasons: one, those devices are normally "well behaved", making very
> detailed cLUT-type profiles unnecessary. Two, and maybe more
> important:
> most CMMs don't seem to behave well when used with cLUT profiles.
> matrix+curves is the most widely accepted type of profile.
>
> Am 13.04.2010 18:36, schrieb adam k:
>> Which monitor profile type LUT
>> Matrix&curves etc is most appropriate for wide gamut monitor?
>>
>> Sent by AAK from iPhone 3Gs
>>
>> On Apr 12, 2010, at 10:41 PM, Graeme Gill <graeme@xxxxxxxxxxxxx>
>> wrote:
>>
>>> Keith Winstein wrote:
>>>> A bit of a tangent, but thought somebody here might know -- is
>>>> there an industry standard for how these "percentage gamut covered"
>>>> figures are stated?
>>>
>>> There's a (very poor and misleading) de facto standard.
>>>
>>>> I assume they put the gamut and the triangle formed by the monitor
>>>> illuminants in the same colorspace, and say an increment in any
>>>> direction is as good as any other, and calculate the fraction of
>>>> the gamut's area covered by the monitor's triangle.
>>>
>>> It's the xy chromaticity diagram triangle areas. The problems with
>>> this are:
>>> * The xy chromaticity diagram is very perceptually non-linear.
>>> * Gamuts are 3D not 2D.
>>>
>>> You can use Argyll's "viewgam -i" to get a more meaningful gamut
>>> volume
>>> comparison.
>>>
>>> Graeme Gill.
>>>
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