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    Re: Navigation instruments from Paris, Maskelyne
    From: Joel Jacobs
    Date: 2004 Jul 21, 07:07 -0400

    The up graded edition of the Limited Edition of Photoshop 5.0 is available
    direct from Adobe for $99.00. It likely can be bought on ebay for much less.
    GO:
    
    http://www.adobe.com/products/photoshople/main.html
    
    I recommend it because the operations and use of its comprehensive tools are
    intuitive do not require a lot of learning.
    
    There are some pictures on this page which I think are quite nice.
    http://www.landandseacollection.com/id38.html
    
    They were taken with an Olympus D 400 rated at 1.3 MP, and edited with the
    LE 5.0 Edition of Photoshop. They were saved at 3 on the JPEG Options scale
    (histogram) which determines file size.
    
    Joel Jacobs
    
    
    ----- Original Message -----
    From: "Peter Fogg" 
    To: 
    Sent: Tuesday, July 20, 2004 11:35 PM
    Subject: Re: Navigation instruments from Paris, Maskelyne
    
    
    > Photoshop is the most well known (and possibly the most demanding to use
    well) image management
    > software. Since computer screens only output at about 72 pixels per inch
    (they vary) there usually is no
    > reason to send pics for viewing on a monitor at a resolution any higher
    than this. In Photoshop,
    > choose 'image size' then save a copy of your pic at this resolution and at
    an appropriate size for viewing.
    > Then convert it to .jpg file format, but only after you have completed all
    other operations, as this step
    > loses image quality each time, the effects are accumulative. If your
    camera records in .jpg then convert to
    > another lossless format as the first step, then reconvert as the last. I
    wouldn't be surprised to learn that
    > there is software freely available that could do all this. Photoshop is
    really a professional application and is
    > quite expensive, although there are different versions available.
    >
    > "how to diminish them and not to degrade them too much" Photoshop
    certainly has wonderful tools. One of
    > the most useful is a histogram, called 'levels', which is like a
    statistical map of the amount of dark and light
    > tones. Almost every picture can be improved by playing with its 'levels'.
    But this is hardly scratching the
    > surface of what is possible with computer image manipulation. There is
    much information online. Its a big
    > subject.
    >
    > Quoting Jan Kalivoda :
    >
    > > Hello, Joel,
    > >
    > > thank you for your remark. I am fully aware of your troubles, but
    working
    > > only from internet cafes in Paris, I cannot help you and me now. I will
    be
    > > able to redress and republish my pictures only in August from Prague.
    > >
    > > Meanwhile, can you give me advice about software and modes that shall I
    use?
    > > I tried higher compression ratios for these JPG's, but the quality
    suffered.
    > > And as these pictures are not the best even uncompressed (it was a bit
    > > difficult to take them in an unsuitable room, deep behind the glass), I
    > > wonder, how to diminish them and not to degrade them too much.
    > >
    > >
    > > Thanks, Jan Kalivoda
    > >
    > > Joel Jacobs writes:
    > >
    > > > Hello Jan,
    > > >
    > > > Thank you for the invitation. But, the file sizes of you pictures
    average
    > > > about 2 Megs. For some of us they take too long to load even with
    > > broadband.
    > > >
    > > > Simple photo editing software would allow you to get the file size
    down to
    > > > 20 KB and still have good pictures.
    > > >
    > > > BTW, The first picture is still working on opening.
    > > >
    > > > I very interested in what you published, but haven't more time,
    > > >
    > > > Joel Jacobs
    > > >
    > > >
    > > >
    > > >
    > > > ----- Original Message -----
    > > > From: "Jan Kalivoda" 
    > > > To: 
    > > > Sent: Monday, July 19, 2004 5:39 PM
    > > > Subject: Navigation instruments from Paris, Maskelyne
    > > >
    > > >
    > > >> Hello,
    > > >>
    > > >> if anybody wants, login to "http://www.xdrive.com" under the login
    > > >> "navigation{at}seznam.cz" (XDRIVE allows only valid e-mail addresses as
    > > > logins,
    > > >> as you probably know), password "celnav".
    > > >>
    > > >> You have 60 MB photos of some historical navigation instruments kept
    in
    > > > the
    > > >> Marine Museum in Paris (directory "Musee de la Marine") there. I
    tried to
    > > >> create the logical sequence of them from the nocturnal and the Jacob
    > > staff
    > > >> to repeating lunar circles.
    > > >>
    > > >> Of course, I am not a professional photographer and I didn't have the
    > > >> instruments available "au plain air".
    > > >>
    > > >> At the end of this week, I shall obtain some copies of Maskelyne's
    less
    > > >> known works printed in the 18th century. It would be interesting to
    chat
    > > >> about them a bit in the list.
    > > >>
    > > >>
    > > >> Jan Kalivoda
    > >
    
    
    

       
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