Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Digital Camera CEL NAV photos
    From: George Huxtable
    Date: 2008 Aug 10, 17:27 +0100

    This may perhaps be a bit of a diversion  from the main thrust of our
    original investigation. But those curious apparent-flares around the Sun
    edge have intrigued me somewhat. I've been looking at those images, and
    particularly picture 11 that came with [6070], in more detail.
    
    Although Greg informed us that the original Sun image was 108 by 108 pixels
    (or thereabouts), the image, as it arrived to me, covered something like 680
    by 680 pixels, as became obvious when it was blown up further on my screen.
    So at some stage it had been resampled, and software, somewhere, had done
    its best with the original bitty image, to expand it up and smear it out,
    over 36 times as many pixels as before. That may indeed be a good way to
    expand a family photo, for example, but in our present inquiry, does that
    treatment create unwanted artefacts that may be confusing our original
    contrasty, and perhaps overexposed, image of the Sun? I only ask...
    
    I hesitate to ask for more from Greg, who has done much to aid us in
    providing good information and nice pictures of his observations. But does
    he have a way to transmit his image as an attachment that shows no more than
    that Sun disc, with a bit of a margin around it, say 150 x150 pixels or so,
    at its original bitty encoding, without inflation? That might tell us more
    about what the camera alone is doing with the Sun image, without being
    messed-about by anything else on the way to us. If I had any idea, myself,
    how to do that, I would offer advice: but I don't.
    
    George.
    
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site