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Article #1036

Re: Photo-CD Technical Details

#1036
From: Marc T. Kaufman
Date: Wed, 13 Jan 1993 02:18
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cs90deh@brunel.ac.uk (Darryl E Humphrey) writes:

>Does anybody know what is the actual hardware configuration used, and what kind
>of software is used in these machines? I was very surprised to read that a
>machine such as this was used for such image processing, as to digitise a
>photographic image, store the resulting data file, and then save onto Compact
>Disc format not only requires a huge amount of backing storage space (assuming
>you aim to reproduce the image quality obtainable by modern camera film), but 
>also a very high-powered system to process this information. I would have
>assumed that the task would have been carried-out on something on a much larger
>scale!

>Any details?

Well, a "typical" full resolution PhotoCD image (2048 x 3072, 24 bit color)
compresses to about 4MB on the CD.  That doesn't require an inordinate
amount of backing store.  As I understand it, this is lossless compression.

-- 
Marc Kaufman (kaufman@CS.Stanford.EDU)
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From: kaufman@Xenon.Stanford.EDU (Marc T. Kaufman)
Subject: Re: Photo-CD Technical Details
Message-ID: <kaufman.726891537@Xenon.Stanford.EDU>
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Date: 13 Jan 93 02:18:57 GMT
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