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Date: Mon, 04 Oct 2004 16:11:01 -0700
From: Chris Cox <ccox@adobe.com>
Subject: Re: [Tiff] Re: BigTIFF extension issue
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At 9:34 AM +0100 10/4/04, Andy Cave wrote:
>Hi Chris.
>
>I'm curious - can you name some examples please. I'd be interested 
>in hearing about some and seeing exactly what the differences 
>are/were between 'changes'.

Photoshop PSD -> 8 byte offsets became PSB because users couldn't 
understand why it wouldn't open in older versions of Photoshop 
(having been mostly compatible from 3.0 to 7.0).

PDF and EPS are examples where the version number didn't change, but 
older apps may break or not read the files.

JPEG -> JPEG2000:  same group, same goal, different format, different extension


Most of my other examples are along the lines of PSD -> PSB, but 
aren't image formats.


In short:  it's easy to change the internal version number ONLY if 
customers don't have an expectation that this file format will 
somehow always work across applications and versions.

Chris
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