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    Re: Rust's diagram for computing azimuth
    From: Peter Fogg
    Date: 2007 Oct 11, 11:40 +1000
    Apreciate you taking the trouble of sending these illustrative images; indeed worth a thousand words, John.
    The simplest way to reduce the file size is to reduce the resolution. Most computer monitors display at 72 ppi (pixels per inch) so greater resolution than this is wasted data - if looking at the image on a computer monitor is the end use.
    However, if the image is being shared so it can, for example, be printed out, then 72 ppi is generally inadequate. Tables with small text could end up illegible. Somewhere in the 200 to 300 ppi range is better for that.

    On 10/11/07, John Cole <jfcole{at}tokopah.com> wrote:

    Oops! I apologise to all for the big file. And I just committed the
    same offense again. I will research how to reduce the file size next

    John Cole

    On Oct 10, 12:08 pm, Bill <billyre...---.net> wrote:
    > George wrote
    > > John Cole's references to Burdwood were interesting, and the page from the
    > > tables provided a useful illustration. But I ask John to consider that not
    > > all of us have a broadband connection, when he sends out attachments at
    > > nearly 4 megabytes.
    > > This list doesn't discourage attachments, but asks that they should be kept
    > > short. I would suggest that a megabyte, or perhaps two, should be taken as
    > > an upper limit.
    > I would second George's request.  At some point many dial-up ISP's will
    > refuse to download the file (approx. 5MB).  A 4MB file on my machine
    > requires about 15 minutes.  That is a long wait, especially if it is a topic
    > one is not following and destined for the bit bucket (deleted). Personally I
    > would suggest an upper limit, MAXIMUM, of 1 MB. There is not much that a
    > screen resolution (72 ppi) in GIF or a medium-high JPEG that would come
    > close to that limit. A higher resolution (240+ ppi) should be parked on a
    > site where download is optional IMHO.
    > Thank you
    > Bill

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