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Archiver > TMG > 2008-07 > 1217285251


From: "Diana Gale Matthiesen" <>
Subject: Re: [TMG] OT saving digital images TIFF vs JPEG vs GIF
Date: Mon, 28 Jul 2008 18:47:31 -0400
References: <005b01c8f0d3$4ea94160$0301a8c0@BJLaptop><488E2D9F.4090803@well.com><1337920772.20080728182719@comcast.net>
In-Reply-To: <1337920772.20080728182719@comcast.net>


Yes, JPEG is not the intended format for what is called "line art" (text and
graphics that have solid colors.) The best format for line art is GIF.

If the image is what is called, "continuous tone," such as a photograph (color
or black and white) or a scan of a document, then the prefered format for
onscreen viewing is JPEG.

What image formats you have the option to use depends on the scanning software.
If you intend to print the file, TIFF is the format to choose. If you only
intend to view the image onscreen, what you want is a JPEG.

Software also varies in whether it offers you options on the *quality* of the
JPEG, which can be from low to high, usually on a scale of 1 to 10. If the
scanning software isn't giving you good quality JPEGs, then do save as a TIFF
and convert it later to a JPEG with your image-editing software.

Diana

> -----Original Message-----
> From: On Behalf Of Eric Haas
> Sent: Monday, July 28, 2008 6:27 PM
> To: kathryn gratop
> Subject: Re: [TMG] OT saving digital images TIFF vs JPEG
>
>
<snip>
>
> The compression algorithm used by JPEGs was designed for the gradual
> changes in color that you find in photographs. It doesn't do as well
> with the abrupt changes from black to white that you find in text
> documents and line drawings.
>

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