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List:       kde-kimageshop
Subject:    Re: Explanation of when to use which scaling fitler
From:       Thomas Zander <zander () kde ! org>
Date:       2005-10-13 10:17:49
Message-ID: 200510131217.54227.zander () kde ! org
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On Saturday 08 October 2005 19:39, Boudewijn Rempt wrote:
> We could put up this information in our scaling dialog, and even
> better, preselect the right one based on whether we're scaling up or
> down.

I would suggest to put a checkbox there 'auto select best filter' which 
will only enable the combobox when unchecked.

We should take a range of images and scale them in various directions and 
sizes and create a little matrix based on the results.
I'm thinking along the lines of
- scale up to 125%
- scale up to 200%
- scale up to 5000%
- scale down to 80%
- scale down to 50%
- scale down to 10%

In my experience these various scales need different methods of scaling to 
get the best result. I'm guessing different filters will also make a big 
difference.
Otherwise you might want to follow an old trick I use to scale images way 
up or way down.   a) blur b) scale to 50% c) sharpen d) goto b untill you 
reach the required res.

-- 
Thomas Zander

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