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Date: Sun, 23 Mar 2014 21:52:17 +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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With PHOTOMETRIC_SEPARATED + TIFFTAG_SAMPLESPERPIXEL == 4 +
EXTRASAMPLE_UNSPECIFIED == 2 (4+2) it would be possible to some a
convention.

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.

kind regards
Kai-Uwe

Am 23.03.2014 20:37, schrieb Oncaphillis:
> Actually for now I just need a way to view the output of my own AGG
> based rendering engine which should support DeviceN and other kinds
> of higher dimension colour spaces. If one could point me to another
> tool that displays this kind of data or to a simple way to generate
> PSD or PDF from an in-memory bitmap representation it would be highly
> appreciated.
>
> Sebastian
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