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Date: Wed, 04 Jul 2007 19:28:44 +0200
To: tiff@lists.maptools.org
Subject: Re: [Tiff] 16-Bit-Per-Channel Lossless Compression
From: "Michael Wolf" <michael.wolf@infinimap.com>
Organization: db&w GbR
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Status:   

On Wed, 04 Jul 2007 19:13:40 +0200, Stephen Carlsen <sc42business@mac.com> wrote:

> If we can come up with a simple approach that gives us on the order
> of 2:1 compression of 16 bit photographs, is this useful, or are
> storage space and bandwidth now so inexpensive that we don't care any
> more?

You might want to have a look at openEXR and the compression schemes it uses (most of them lossless). They have been designed for 16/32bit float and real world imagery (i.e. film, which is close enough to photographs). None of them achieve 1:2 though. You're lucky if you manage to shave off 30%-40%.

Cheers,
Mike

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