pls unscribe me. thank you.
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Today's Topics:
1. Re: . Re: Deconvolution plugin for GIMP? (Doug) (Toby Haynes)
2. Re: . Re: Deconvolution plugin for GIMP? (Doug) (Doug)
3. Re: ? about shrinking pics on GIMP 2.... (Matthias Julius)
----------------------------------------------------------------------
Message: 1
Date: Sun, 24 Feb 2008 20:28:23 -0500
From: Toby Haynes
Subject: Re: [Gimp-user] . Re: Deconvolution plugin for GIMP? (Doug)
To: gimp-user@lists.XCF.Berkeley.EDU
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Alchemie foto\grafiche wrote:
> >'d be interested to know of any such plugin too. I have a number of
> >images with directional camera shake that Refocus fails to handle at all
> >well.
>
> did you try convolution matrix ( in Filter/Generic)
That applies the convolution to the image. In this case I want to
reverse the process - which is a lot harder to do and has been the
subject of many papers. Of all the approaches I've seen, I've been most
impressed with the Maximum Entropy approaches to deconvolution -
however, those require a reasonable guess at the original convolution
function (prior).
Cheers,
Toby Haynes
------------------------------
Message: 2
Date: Mon, 25 Feb 2008 09:53:16 +0000
From: Doug
Subject: Re: [Gimp-user] . Re: Deconvolution plugin for GIMP? (Doug)
To: gimp-user@lists.XCF.Berkeley.EDU
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Toby Haynes wrote:
> Alchemie foto\grafiche wrote:
>
>>> 'd be interested to know of any such plugin too. I have a number of
>>> images with directional camera shake that Refocus fails to handle at all
>>> well.
>>>
>> did you try convolution matrix ( in Filter/Generic)
>>
> That applies the convolution to the image. In this case I want to
> reverse the process - which is a lot harder to do and has been the
> subject of many papers. Of all the approaches I've seen, I've been most
> impressed with the Maximum Entropy approaches to deconvolution -
> however, those require a reasonable guess at the original convolution
> function (prior).
>
> Cheers,
> Toby Haynes
> ______________________________________________
>
That would be completely beyond me, unfortunately!
Cheers,
Doug
------------------------------
Message: 3
Date: Mon, 25 Feb 2008 14:35:23 -0500
From: Matthias Julius
Subject: Re: [Gimp-user] ? about shrinking pics on GIMP 2....
To: gimp-user@lists.xcf.berkeley.edu
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
Rei Shinozuka writes:
> shrinking images always involves some form of
> smoothing, and some amount of sharpening afterwards
> is generally useful. i usually do this:
Shrinking of screenshots is generally problematic as there are
probably many features on there that are only 1 pixel wide (lines and
text). If you scale that down it is doomed to look ugly.
A 1 pixel wide black line on white background will end up gray if
scaled down. Sharpening can improve that.
A small font where every pixel counts will be unreadable and no
sharpening can recover that.
What are the images for?
Matthias
------------------------------
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