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From: "Pascal Peuch" <peuchpascal@wanadoo.fr>
To: "Bob Friesenhahn" <bfriesen@simple.dallas.tx.us>
References: <IDHSNO$40BD5C905B2EE2E0EAE146C199F6DA00@libero.it>
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Subject: Re: [Tiff] Re: Tiff file with Transparency mask (former 'Photoshop
	Masked area TIFF images')
Date: Fri, 18 Mar 2005 23:17:23 +0100
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X-UIDL: 20186d03b2237ef8594130b9aa124d29

I would add that, according to the standard, though 
PhotometricInterpretationTag specific value [4] is in the scope of the 
baseline, baseline readers are not supposed to read more than the first IFD 
(but they are supposed not to crash).

I'll send you such a file next week.

Thanks

----- Original Message ----- 
From: "Bob Friesenhahn" <bfriesen@simple.dallas.tx.us>
To: "Pascal Peuch" <peuchpascal@wanadoo.fr>
Cc: <tiff@remotesensing.org>
Sent: Friday, March 18, 2005 12:44 AM
Subject: Re: [Tiff] Re: Tiff file with Transparency mask (former 'Photoshop 
Masked area TIFF images')


> On Fri, 18 Mar 2005, Pascal Peuch wrote:
>>
>> I am at the moment specifying a new raster map product and I intend to 
>> use the transparency mask for encoding the padding (void areas).
>
> I recommend testing with Photoshop.  Anything you can create using 
> Photoshop is likely to work with it.  Some applications are likely to have 
> problems with handling a separate transparency mask.  They may complain or 
> even crash.  I know that the software I maintain does not handle it right 
> now.
>
> In my testing, I find that associated alpha works well with Photoshop, but 
> of course that consumes more resources than a simple bilevel mask since 
> the alpha channel needs to be the same depth as the other channels, and 
> math is required.  Unassociated alpha can be used with Photoshop, but only 
> if an experienced user tells Photoshop how to use it.  Unassociated alpha 
> is presented as an extra channel which can be assigned for use (by the 
> user) as a mask.
>
> Do you have a sample file that we can test with?
>
> Bob
>
>> <bfriesen@simple.dallas.tx.us>
>> To: "Pascal Peuch" <peuchpascal@wanadoo.fr>
>> Cc: <tiff@remotesensing.org>
>> Sent: Thursday, March 17, 2005 11:49 PM
>> Subject: Re: [Tiff] Photoshop Masked area TIFF images
>>
>>
>>> On Thu, 17 Mar 2005, Pascal Peuch wrote:
>>>
>>>> Does anyone has ever seen a TIFF file with a transparency mask?
>>>> And do you know commercial softwares dealing with transparency masks.
>>>
>>> I assume that you are talking about an image which contains a second 
>>> bilevel TIFF frame with photometric set to PHOTOMETRIC_MASK (4)?
>>>
>>> Bob
>>> ======================================
>>> Bob Friesenhahn
>>> bfriesen@simple.dallas.tx.us, 
>>> http://www.simplesystems.org/users/bfriesen/
>>> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>>>
>>
>>
>> _______________________________________________
>> Tiff mailing list
>> Tiff@remotesensing.org
>> http://xserve.flids.com/mailman/listinfo/tiff
>>
>
> ======================================
> Bob Friesenhahn
> bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> 


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