Halftone Removal

T
Posted By
tmk
Jun 8, 2005
Views
439
Replies
3
Status
Closed
Greetings,

I am wondering if there is a plug-in avaliable to do halftone removal. If there aren’t are there some good photoshop techniques. I do have some luck with multiple resizing steps but I would like something more robust. Sice the patterns are so regular and obvious, I know that Fourier techniques would work but I’d like to see an automated method.

Thanks for your time!

Tom
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Kinter 507-284-4981
Mayo Foundation Rochester MN 55905 USA
http://www.mayo.edu/ultrasound
Tom’s Place http://www.tkinter.smig.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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halftone remove

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P
Photo-Plugins
Jun 8, 2005
Tom Kinter wrote:
Greetings,

I am wondering if there is a plug-in avaliable to do halftone removal. If there aren’t are there some good photoshop techniques. I do have some luck with multiple resizing steps but I would like something more robust. Sice the patterns are so regular and obvious, I know that Fourier techniques would work but I’d like to see an automated method.

Thanks for your time!

Tom
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Kinter 507-284-4981
Mayo Foundation Rochester MN 55905 USA
http://www.mayo.edu/ultrasound
Tom’s Place http://www.tkinter.smig.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I wrote this recently:
It’s going to sound greek to you because it is actually written in greek http://www.dpgr.gr/index.php?page=FourierPS
But if you check out the links and the pictures, I’m sure you’ll get the point.
Mr Chirokov’s FFT plugins are available at
http://plasma.mem.drexel.edu/chirokov/archive.htm#FFT

An (awfull) translation of the article in english can be obtained here: http://babelfish.altavista.com/

An alternative approach is to apply multiple passes with NeatImage, a noise reduction application, also available as a Photoshop plugin.
R
RSD99
Jun 13, 2005
Fourier methods actually work quite well … you might take a look at some of the Reindeer Graphics Image Processing tutorials and plugins.

http://www.reindeergraphics.com/

http://www.reindeergraphics.com/tutorial/index.shtml

The exact procedure for halftone removal is described at http://www.reindeergraphics.com/tutorial/chap4/fourier13.htm l

"Tom Kinter" wrote in message
Greetings,

I am wondering if there is a plug-in avaliable to do halftone removal. If
there aren’t are there some good photoshop techniques. I do have some luck with multiple resizing steps but I would like something more robust. Sice the patterns are so regular and obvious, I know that Fourier techniques would work but I’d like to see an automated method.
Thanks for your time!

Tom
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Kinter 507-284-4981
Mayo Foundation Rochester MN 55905 USA
http://www.mayo.edu/ultrasound
Tom’s Place http://www.tkinter.smig.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

R
RSD99
Jun 13, 2005
Also see
http://www.retouchpro.com/forums/showthread.php?t=10660& page=3&pp=15&highli ght=fft

Page down to the last posting … ‘Summary’ by Cameraken.

"RSD99" wrote in message
Fourier methods actually work quite well … you might take a look at
some
of the Reindeer Graphics Image Processing tutorials and plugins.
http://www.reindeergraphics.com/

http://www.reindeergraphics.com/tutorial/index.shtml

The exact procedure for halftone removal is described at http://www.reindeergraphics.com/tutorial/chap4/fourier13.htm l

"Tom Kinter" wrote in message
Greetings,

I am wondering if there is a plug-in avaliable to do halftone removal.
If
there aren’t are there some good photoshop techniques. I do have some
luck
with multiple resizing steps but I would like something more robust. Sice the patterns are so regular and obvious, I know that Fourier techniques would work but I’d like to see an automated method.
Thanks for your time!

Tom
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Kinter 507-284-4981
Mayo Foundation Rochester MN 55905 USA
http://www.mayo.edu/ultrasound
Tom’s Place http://www.tkinter.smig.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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