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)

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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:
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

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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:
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

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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:
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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