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From: Toby Thain <toby@telegraphics.com.au>
Date: Mon, 23 Feb 2009 13:01:41 -0500
To: "Joris Van Damme \(AWare Systems\)" <info@awaresystems.be>
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Subject: Re: [Tiff] losslessly wrap jpeg file into TIFF
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On 23-Feb-09, at 12:01 PM, Joris Van Damme ((AWare Systems)) wrote:

> Toby,
>
>
>>> - There's at least one JPEG colorspace that I know of that has no
>>> equivalent
>>> in TIFF, being YCCK. These files might not be too rare, I guess
>>> Photoshop
>>> likely uses this colorspace when saving CMYK imagery to JPEG.
>>
>> I'm sure Chris Cox will chime in here, but no colour space conversion
>> is applied by Photoshop when saving CMYKs. Such behaviour would be
>> catastrophic to prepress workflows. I can't speak for details, but
>> the C,M,Y,K planes are stored independently in JPEG, as in TIFF or
>> PSD - a de facto "separated CMYK" colour space similar to that
>> defined for TIFF.
>
> While I still think it likely YCCK in JPEG is/can-be/could-at-some- 
> time-be
> produced saving CMYK imagery as JPEG in Photoshop,

That would not mesh with my 20 year experience with Photoshop, but I  
welcome a final word from Chris Cox.

--Toby

> the exact origin is not
> the issue. The issue is, we have at least one JPEG colorspace that  
> I know of
> that has no equivalent in TIFF, being YCCK. There's no doubt about  
> that,
> I've several items in my JPEG testfile library to prove it, and a  
> codec
> handling them that proves my understanding of these files.
>
>
> Best regards,
>
> Joris
>

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