Look at the design of Cartes du Ciel, how handle the star dots and magnitudes in a excellent way, why do you must do all this commandos in Guide for to get a acceptable star chart?
hans-goran

----- Original Message -----
From: "Laurent Zimmermann" <lzmn@...>
To: <guide-user@yahoogroups.com>
Sent: Tuesday, September 11, 2001 8:04 PM
Subject: Re: [guide-user] size


> Hi Hans-Goran,
>
>
> The human eye is able to adapt to very different brightnesses as Venus
> (mag -4) and weak stars (mag 6); that represents a difference of 10 mag,
> that is to say a brightness ratio of 10,000. A computer's display is only
> able to give 256 levels of brightness. So it is impossible to render the
> stars' brightnesses in a so-called "realistic way".
>
> As a consequence, some "conventions" have to be accepted, e.g. the
> diameters of the stars are linked to the magnitude.
>
> In the case of the Sun and the Moon, such a convention is unapplicable,
> because these bodies have apparent diameters. For these, the diameter of
> the disk is linked to their actual angular diameter.
>
>
> Laurent Zimmermann
> http://users.skynet.be/zmn/cab
>
> ----- Original Message -----
> From: H.G.Lindberg <gorlin@...>
> To: <guide-user@yahoogroups.com>
> Sent: Monday, September 10, 2001 6:18 PM
> Subject: [guide-user] size
>
>
> > The size of star dots and levels in Guide ,driving me crazy......
> > How get automatick size of star dots versus magnitude in a realistic
> > way????
> > (Vega is bigger then our sun! :o))
> > Regards
> > Hans-Goran
> >
> >
> >
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