Re: Calculating Scan Size OT

From: Phillip Murphy ^lt;[email protected]>
Date: 02/21/04-04:03:19 AM Z
Message-id: <>

MrSid (Multi-resolution Seamless Image Database) is
a standard format for Aerial and Satellite imagery.
It is licensed to Lizardtech from Los Alamos National
Laboratory. This is the same technology that is used in
the FBI's fingerprint image library.

When checking their site last night, I discovered that,
unfortunately, the MrSid Photoshop plug-in is
no longer available and you can only purchase it bundled
with some very expensive aerial or satellite mapping
software. I'm guessing that when Lizardtech acquired
Genuine Fractals their marketing group decided to
promote it for graphic arts rather than MrSid... go figure.

You're right, Genuine Fractals does have it's 8-bit
limitation. However, it can encode lossless or

Perhaps something to explore would be Jpeg2000.
An iteration of it appears in Photoshop CS.
It can encode a lossless file from a 16-bit image.
There are a number of plug-ins for Photoshop
that use Jpeg2000. I haven't looked into it enough
to understand which implementation is best.

Has anyone on the list used this format yet?
It claims to have a 5:1 lossless compression ratio.


Don Bryant wrote:

> Phillip,
> > A 4x or 8x DVD burner is a great solution.
> > If it must be on CDR, consider using a fractal
> > or wavelet compression format.
> >
> > Both Genuine Fractals and MrSid have lossless capability.
> > A Genuine Fractals STN file will allow a lossless compression
> > ratio of approximately 2:1 and visually-lossless at 5:1.
> >
> Strictly speaking, as I understand the product, Genuine Fractals isn't
> completely lossless, perhaps I'm wrong about that though, if I could
> find my GF manual it might explain that. However the disadvantage for
> the STN file format is that it is only an 8 bit image format,
> > I have created visually-lossless files using MrSid with
> > a ratio of 20:1. Only a trained eye could detect a difference.
> >
> I don't know anything about Mr. Sid where can one find info about it?
> Thanks,
> Don
Received on Sat Feb 21 04:01:46 2004

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