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Archiver > CFT-WIN > 2003-06 > 1057014351


From: "George W. Durman" <>
Subject: [CFTW] Re: JPG compression
Date: Mon, 30 Jun 2003 19:05:51 -0400
References: <D36DAA39CC18D211813700005A424EA3023CFEA8@mchw606x.mchw.siemens.de>
In-Reply-To: <001401c33cd0$7b917420$99445218@vf.shawcable.net>


At 6/27/03 01:21 PM Friday, hgd wrote:
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>Hi Tim
>
>A brief description of JPEG.
>
>The higher the Quality setting, (1-10) the more detail the compression
>algorithm preserves. However, using a high Quality setting results in
>a
>larger file size than using a low Quality setting. JPEG compresses
>file size
>by selectively discarding data. Because it discards data, JPEG
>compression
>is referred to as lossy. A higher quality setting results in less data
>being
>discarded.

To: Jerry, and Others

The new Paint Shop Pro 8.0 allows one to save JPEG files in a
"Lossless"
format, which does not "selectively discard data"; however, the
Lossless
format apparently won't work in CFTW.

I saved one of my genealogy graphics as 1) a Lossless JPG file, and 2)
a
Progressive JPG file. The Progressive file DOES work in CFTW; the
Lossless file does NOT.


>Baseline ("Standard") to use a format recognizable to most Web
>browsers.
>Baseline Optimized to optimize the color quality of the image and
>produce a
>slightly smaller file size. This option is not supported by all Web
>browsers.
>Progressive to create an image that displays gradually as it is
>downloaded--in a series of scans (you specify how many) showing
>increasingly
>detailed versions of the entire image. Progressive JPEG images files
>are
>slightly larger in size, require more RAM for viewing, and are not
>supported
>by all applications and Web browsers.
>
>Jerry
>(snipped)
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