Archived posting to the Leica Users Group, 2001/01/14

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Subject: Re: [Leica] Digital Image File Formats
From: "" <>
Date: Sun, 14 Jan 2001 22:47:43 +0100
References: <> <> <>

Dave, I use something called Genuine Fractals. It is a Photoshop plug-in
that allows you to store images in a compressed form, open them at any size
without the loss of quality that comes with upscaling in photoshop. You need
about a 20 meg file for it to work at its best which then compresses to
10-15megs. Once opened you can convert the file into any format you want via
photoshop 'save as' command. Tina manley put me on to it (thanks Tina). I
also use Vuescan which stops me using crazy resolutions. I normally scan in
Vuescan using 16bit grayscale, to about 11x16 inches with a res of about
340/360. When I've adjusted levels/curves in PS I then convert to 8bit
grayscale which leaves a file of about 20meg for GF to compress. There is a
demo at

- ----- Original Message -----
From: "Dave Richards" <>
To: <>
Sent: Sunday, January 14, 2001 10:00 PM
Subject: [Leica] Digital Image File Formats

> The current thread concerning the archival storge of digital images brings
> up another question:
> Which of the file formats currently available for the hobbyist (GIF, JPG,
> TIFF, BMP, etc) offers the greatest image quality and color rendition with
> the least loss of information?  I am making an assumption that stored file
> size isn't an issue, at least in regard to the answer to this question.
> For instance, I have been told that JPEG images, if uncompressed for
> editing and then recompressed, will lose information, but I've also heard
> that there is such a thing as a JPEG algorithm that doesn't lose
> information when uncompressed/recompressed.
> I know practically nothing about this as you can probably guess, so any
> information the members can provide will be helpful.  Also, if anyone can
> direct me to one or more web sites or documents that can provide me with
> enlightenment I will be grateful.
> Dave Richards
> Littleton, Colorado, USA

In reply to: Message from Christopher Hoover <> ([Leica] OT: Archival of digital images)
Message from "Dave Richards" <> ([Leica] Digital Image File Formats)