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Re: [OM] ( OM ) New photos - non-film, sorry

Subject: Re: [OM] ( OM ) New photos - non-film, sorry
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 02 Nov 2009 11:59:37 -0500
Mr. Sachs was so adamant on this point that I don't think he'd agree 
with your exceptions.  But you have the power to prove him wrong.  Can 
you demonstrate your point using Picture Window Pro... his own product?

Chuck Norcutt


Ken Norton wrote:
>> I once asked Johathan Sachs (author of Picture Window) what he thought
>> about step-wise resizing.  He said that if step-wise resizing did a
>> better job than doing it all in one go the author of the resizing
>> algorithm in use didn't understand how to properly implement the algorithm.
>>
> 
> 
> All due respect to Mr. Sachs, but this isn't entirely true. There are times
> when a 2-3 step resizing is desirable. But to do so, you need to use very
> odd percentages, making sure that you don't repeat any multiple of
> previously use stepsize. This helps break up the sawtooth edges.
> 
> Oh, when downsizing, do not sharpen first. Otherwise you'll end up with
> aliasing artifacts. In fact, when downsizing something that has repeating
> patterns and you get nasties, apply a gaussian blur to the image equal to
> the ratio of pixel reduction. For example, if downsizing by 50%, then blur
> 2-pixels.  Downsizing to 25% of original?  3-pixel blur is required.
> 
> AG
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