> Also, if you start to see halos, you've gone too far.

You are likely to see halos in pictures taken from an aeroplane, 
even if you have not done any sharpening ;-). For example:
http://www.polarimage.fi/phenom/hl00142b.jpg

Halos are one nice thing to look for and photograph when you're
traveling
airborne (and maybe bored with nothing to do).

Antti-Pekka

________________________________________

Antti-Pekka Virjonen

Computec Oy

www.computec.fi

> -----Original Message-----
> From: Ryan Brooks [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, April 19, 2006 2:50 AM
> To: [email protected]
> Subject: Re: photography from an airplane and unsharp mask
> 
> 
> > 2. When do you use sharp/unsharp filters in the PS or
> > other software? (any hints on how to judge a reasonable level?)
> >
> >
> Keep in mind your target.  Sharpening for the web is different than
> sharpening for a printer, for example.   I believe some of the
> sharpening plug-ins available keep this in mind.
> 
> Also, if you start to see halos, you've gone too far.
> 
> IMHO, the image is too sharp... you've created some moire in the
> building windows.  Frankly, it looks like it could benefit from an
> (auto)levels more than anything- makes the  haze go away.
> 
> -Ryan
> 
> 


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