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Re: filmscanners: Re: Scanning problems

In a message dated 2/5/2001 9:19:45 AM EST, CookeJ@logica.com writes:

> I've just had my 6x7 trannies scanned by a lab specialising in digital. I
>  paid for a 50MB scan and got a 7MB jpeg back. I took the CD back to the
>  manger, who told me that it was a 50MB scan, compressed to 7MB and that all
>  the information would be there when I opened it up!

I think the manager is correct.  This is only 7:1 compression, and I
suspect that if you did a bit by bit subtraction of the jpeg and tiff
files you'd find at most some errors in the least significant bit.

There's certainly no way you'd see a difference with the naked
eye or by printing the images, even after manipulating them
digitally (assuming the images are within 10% of their final
intensities).  I'm sure lots of people will jump in and claim this is
incorrect, but it would be most useful if these people would post
web pages with images that show a counterexample to this.

In this case, a picture truly is worth a thousand words, and
I hope this doesn't degenerate into a thread with a thousand
messages <smile>.

Ed Hamrick


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