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Date: Sun, 23 Mar 2014 22:20:51 +0100
From: Kai-Uwe Behrmann <ku.b-list@gmx.de>
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Subject: Re: [Tiff] Spot colors in TIFF
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Am 23.03.2014 22:14, schrieb Oncaphillis:
> On 03/23/2014 09:52 PM, Kai-Uwe Behrmann wrote:
>> With PHOTOMETRIC_SEPARATED + TIFFTAG_SAMPLESPERPIXEL == 4 +
>> EXTRASAMPLE_UNSPECIFIED == 2 (4+2) it would be possible to some a
>> convention.
>
> This is already what the TIFF looks like In addition there are the
> Spot Color names in the Photoshop Image Resource TAG
>
>>
>> In order to display the data a viewer would need a link of a name for
>> the separate colour (say gold + silver) to a actual CIE*Lab value. This
>> can be supplied by a additional ICC Named colour profile (ncl2) beside
>> your normal ICC profile for the Cmyk data. The normal ICC profile is
>> that residing inside the TIFFTAG_ICCPROFILE of the actual IFD. I am not
>> sure how a second named colour profile can be defined inside one Tiff
>> IFD.
>>
>> Perhaps a completely different Tiff tag is already defined, ready to
>> describe the colorant of the additional spot colour channels.
>
> This could be located in two other Photoshop specific TAGS #700 and 
> #37724.

Are these tags somewhere defined?

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