[argyllcms] Re: gamut conversion through the LUT ?!
- From: lee scratchy <leescratchy@xxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Tue, 22 Jul 2008 14:04:17 +0000
> Graeme Gill wrote:
> In what sense ? They make a mistake in saying that 3D LUTs cannot be
> inverted exactly, but perhaps they mean that such an inversion cannot
> be done quickly and exactly, which is true.
>
> Graeme Gill.
well you can't do a 3x3 matrix with three 1D LUTs, can you ?
you need a 3D LUT altogether ?! or maybe it was implied...
-Maxime
>
>> "Use the ICC Curve-and-Matrix model:
>>
>> Film density -> Three 1-D LUTs -> 3x3 Matrix -> Scene XYZ
>>
>> This Curve-and-Matrix model can be inverted exactly for converting Scene XYZ
>> to Film density
>>
>> NOTE: 3D LUTs cannot be inverted exactly"
>>
>> so they made a mistake I guess ?!
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