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From: Steven Woody <narkewoody@gmail.com>
To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
Subject: Re: [Tiff] tiff unknown field of tag
Organization: 2046
References: <877jf1n4kg.fsf@narke.yellow.line>
	<Pine.SOC.4.60.0508041003230.11359@blade.simplesystems.org>
Date: Thu, 04 Aug 2005 23:33:57 +0800
In-Reply-To: <Pine.SOC.4.60.0508041003230.11359@blade.simplesystems.org> (Bob
	Friesenhahn's message of "Thu, 4 Aug 2005 10:10:27 -0500 (CDT)")
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Status:   

Bob Friesenhahn <bfriesen@simple.dallas.tx.us> writes:

> On Thu, 4 Aug 2005, Steven Woody wrote:
>
>>
>> i got back some scaned tiff's from a photo lab. openning with xv or gimp
>> just got a warning message: unkown field of tag 34665(0x8769). i want to know
>> what's wrong with thoese files and how do a work around.
>
> The warning does not mean there is something "wrong" with the file, it 
> just means that there is a tag in the file that libtiff does not 
> support.  Usually this is benign.
>
>> for the tiffinfo output, i still has two questions desiring kind help from
>> you.
>>
>> 1. what means "ICC Profile: <present>" ? and what is ICC ?
>
> ICC is the International Color Consortium (http://www.color.org/) and 
> an ICC profile is a type of reference "lookup table" which ensures 
> accurate color as long as the using software also properly support ICC 
> profiles.  It allows you to do things like print your photo to a 
> printer (which also has an ICC profile) and obtain accurate color.

what will happen if the ICC embeded in my pic differ with the ICC in the
printer? 

and, i also heard photographers talk about color spaces such as sRGB, which are
also some kind of lookup tables.  is there any relation between ICC and color
space?


>
>> 2. i noticed this file is uncompressed. so what's the benefit the lab save
>>   result in tiff rather than a bmp?
>
> While the latest BMP version supports attaching ICC profiles, many 
> software packages will simply fail to load the BMP entirely.  TIFF is 
> seen as a format used by "professionals" and is well supported by 
> desktop publishing software.  As far as the actual image goes, a 
> 24-bit BMP is just as good as a 24-bit TIFF.

i noticed that tiff support loseless compression, in this case, i beleive that
tiff will be as good as bmp up to the image quality. but if or not tiff
supports loss compression? in this case, i think image quality will going
down. right?

>
> Bob
> ======================================
> Bob Friesenhahn
> bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>

-- 
steven woody (id: narke)

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