Re: Finding CIELab Values from Target Chart TIF
Re: Finding CIELab Values from Target Chart TIF
- Subject: Re: Finding CIELab Values from Target Chart TIF
- From: Joseph Yates <email@hidden>
- Date: Wed, 28 Apr 2010 23:27:11 -1000
>
>>> >> So how does PhaserMatch internally calculate what calibrations
>>> (adjustments)
>>> >> to send to the printer if it doesn't have some sort of reference values
to
>>> >> compare & calculate differences for the acquired measurements?
>
>> >It prints the target using the cmyk values in the file. it then measures
>> them to
>> >obtain lab values. These cmyk, lab value pairs are then used to calulate
>> both a
>> >forward (cmyk -> lab) and a reverse (lab -> cmyk) transform for the device.
>> >Absolute lab values for the target does not make sense as the target is in
>> device
>> >coordinates ie. cmyk and lab. All you can do is calculate how to convert
>> between
>> >the 2, ie. device dependent space (cmyk) and device independent space
>> (lab).
>
>> >Peter
>
Thanks Peter for the explanation. I think (finally!) I¹m beginning to
comprehend how PhaserMatch is performing it¹s calibrations.
Joseph
>
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