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From: Michael D. Berger on 2 May 2010 17:31
Starting with the same tif file, and converting
to the maximum quality jpg image, I get these
approximate sizes:

Capture NX 2: 10,480K
Photoshop CS3: 10,394K
ImageMagick convert: 17,102K

So what do you think of this? I am guessing
that the 17M file has a higher quality image.
Do you agree?

Thanks for your thoughts.
Mike.
From: Matti Vuori on 3 May 2010 05:13
"Michael D. Berger" <m_d_berger_1900(a)yahoo.com> wrote in news:vamDn.113968
$SQ1.101782(a)news.usenetserver.com:

> Starting with the same tif file, and converting
> to the maximum quality jpg image, I get these
> approximate sizes:
>
> Capture NX 2: 10,480K
> Photoshop CS3: 10,394K
> ImageMagick convert: 17,102K
>
> So what do you think of this? I am guessing
> that the 17M file has a higher quality image.
> Do you agree?

No. If it has a higher quality image, you should be able to prove it.
There's no need to guess.
From: Better Info on 3 May 2010 18:11
On 02 May 2010 21:31:07 GMT, "Michael D. Berger"
<m_d_berger_1900(a)yahoo.com> wrote:

>Starting with the same tif file, and converting
>to the maximum quality jpg image, I get these
>approximate sizes:
>
> Capture NX 2: 10,480K
> Photoshop CS3: 10,394K
> ImageMagick convert: 17,102K
>
>So what do you think of this? I am guessing
>that the 17M file has a higher quality image.
>Do you agree?
>
>Thanks for your thoughts.
>Mike.

To find out what is happening try using this:

http://www.impulseadventure.com/photo/jpeg-snoop.html

"JPEGsnoop reports a huge amount of information, including: quantization
table matrix (chrominance and luminance), chroma subsampling, estimates
JPEG Quality setting, JPEG resolution settings, Huffman tables, EXIF
metadata, Makernotes, RGB histograms, etc. Most of the JPEG JFIF markers
are reported. In addition, you can enable a full huffman VLC decode, which
will help those who are learning about JPEG compression and those who are
writing a JPEG decoder."

There was another DOS (command prompt) program called "JPEG Analyzer"
(filename of ja001.zip) that used to be floating around, but it seems to
have disappeared from the net. It would give you the quantization and
huffman tables for any analyzed JPG file.

I found the above just now when searching for the old DOS command-line
program.

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