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Filter for inequality in microfilm brightness ?

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Filter for inequality in microfilm brightness ? s ver 23 Feb 13:12
  Filter for inequality in microfilm brightness ? Gilberto 23 Feb 14:43
  Filter for inequality in microfilm brightness ? Stephan Hegel 23 Feb 14:56
   Filter for inequality in microfilm brightness ? Doug 24 Feb 11:19
s ver
2006-02-23 13:12:24 UTC (almost 19 years ago)

Filter for inequality in microfilm brightness ?

Hallo all,

Digital photos taken from microfilm equipment in public libraries typically come up with inequality in brightness due to imperfect condenser lenses. Gives a bright center and dark corners. (sample at http://users.telenet.be/spica/trial/microfilm.jpg). Has anyone a filter to correct this?

Stefaan

Gilberto
2006-02-23 14:43:18 UTC (almost 19 years ago)

Filter for inequality in microfilm brightness ?

Hi

1 - Make a circular slection 2 - Feather selection by 500 pixels 3 - Inver it ctrl + i
4 - Adjust levels

Here is the same pic: http://www.gimp.com.br/imagens/c.jpg

Gilberto

On Thu, 23 Feb 2006 13:12:24 +0100, "s ver" escreveu:

De: "s ver"
Data: Thu, 23 Feb 2006 13:12:24 +0100 Para: gimp-user@lists.XCF.Berkeley.EDU Assunto: [Gimp-user] Filter for inequality in microfilm brightness ?

Hallo all,

Digital photos taken from microfilm equipment in public libraries typically come up with inequality in brightness due to imperfect condenser lenses. Gives a bright center and dark corners. (sample at http://users.telenet.be/spica/trial/microfilm.jpg). Has anyone a filter to correct this?

Stefaan

Stephan Hegel
2006-02-23 14:56:28 UTC (almost 19 years ago)

Filter for inequality in microfilm brightness ?

s ver wrote:

Digital photos taken from microfilm equipment in public libraries typically come up with inequality in brightness due to imperfect condenser lenses. Gives a bright center and dark corners. (sample at http://users.telenet.be/spica/trial/microfilm.jpg). Has anyone a filter to correct this?

The "Correct->Radial Luminance" filter of Panorama Tools could be helpful in your case.
Stephan.

Doug
2006-02-24 11:19:52 UTC (almost 19 years ago)

Filter for inequality in microfilm brightness ?

Stephan Hegel wrote:

s ver wrote:

Digital photos taken from microfilm equipment in public libraries typically come up with inequality in brightness due to imperfect condenser lenses. Gives a bright center and dark corners. (sample at http://users.telenet.be/spica/trial/microfilm.jpg). Has anyone a filter to correct this?

The "Correct->Radial Luminance" filter of Panorama Tools could be helpful in your case.
Stephan.