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Date: Sun, 23 Mar 2014 20:37:09 +0100
From: Oncaphillis <oncaphillis@snafu.de>
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To: Leonard Rosenthol <lrosenth@adobe.com>, Chris Cox <ccox@adobe.com>, 
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Subject: Re: [Tiff] Spot colors in TIFF
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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

On 03/23/2014 09:36 AM, Leonard Rosenthol wrote:
> What program(s) are you planning on having read this document?  If it=B9s
> not Photoshop, then using Photoshop private data won=B9t be useful. If it=
=B9s
> Photoshop, then you would be better off writing a standard format (such as
> PDF) or native format (PSD).
>
> Leonard
>
> On 3/22/14, 11:10 AM, "Oncaphillis" <oncaphillis@snafu.de> wrote:
>
>> Thanks for the info,
>>
>> I had a closer look at the tif I'm currently trying to analyse.
>>
>> TiffTagViewer
>> http://www.awaresystems.be/imaging/tiff/astifftagviewer.html was
>> a specially helpful. (see screenshot under
>> http://www.oncaphillis.net/tifftags.png. Seems like the file simply
>> defines 7 samples per pixel (CMYK+3 Spot Colors in my case). The
>> "ExtraSamples" Tag define these 3 additional samles as undefined.
>> The Rest of the info one would need is stuffed into the "PhotoShop"
>> Tag.
>>
>> Described here:
>>
>> http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577413_pg=
fI
>> d-1039502
>>
>> Does anyone know if there is code available that helps one parse
>> the "PhotoShop" data block ?
>>
>> Thanks again
>>
>> O.
>>
>>
>> On 03/22/2014 12:39 AM, Chris Cox wrote:
>>> Photoshop writes layer data, and descriptions of the additional alpha
>>> channels in application specific TIFF tags that most other applications
>>> won't read.
>>>
>>> PDF and PSD/PSB are the only other formats that really support spot
>>> colors.
>>> DCS/EPS can hold spot channels, but only for final output - it's not
>>> that
>>> portable.
>>>
>>> Chris
>>>
>>>
>>>
>>> On 3/21/14 4:28 PM, "Oncaphillis" <oncaphillis@snafu.de> wrote:
>>>
>>>> Hi,
>>>>
>>>> I'll have to generate images in CMYK+SpotColor format (e.g PANTONE
>>>> etc.)
>>>> format and would like to store in TIFF. Photoshop supports
>>>> this kind of data but I couldn't find anything about the TIFF file
>>>> organisation. All tools I used under linux seem to ignore the
>>>> additional
>>>> layers. Some just complain about an unknown TAG 37724 (0x935c) for
>>>> which I couldn't find anything usefull.
>>>>
>>>> tiffsplit doesn't split the tiffs at all, so it doesn't seem to be
>>>> a multi-layer TIFF.
>>>>
>>>> Are there any informations available for this format ? Alternatively
>>>> it would be o.k. for me to use another bitmap image format supported
>>>> by other paint programs which supports spot colors for which better
>>>> docs are acailable.
>>>>
>>>>
>>>> Thank you
>>>>
>>>> O.
>>>> _______________________________________________
>>>> Tiff mailing list: Tiff@lists.maptools.org
>>>> http://lists.maptools.org/mailman/listinfo/tiff
>>>> http://www.remotesensing.org/libtiff/
>>>
>>
>> _______________________________________________
>> Tiff mailing list: Tiff@lists.maptools.org
>> http://lists.maptools.org/mailman/listinfo/tiff
>> http://www.remotesensing.org/libtiff/
>

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