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Shay Stephens fringe removal photoshop action?

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harveyzone View Drop Down
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Post Options Post Options   Quote harveyzone Quote  Post ReplyReply Direct Link To This Post Topic: Shay Stephens fringe removal photoshop action?
    Posted: 03 June 2009 at 12:59
Hi there,

Whenever I have searched for tools for removing CA, I invariable read of the wonders of the Shay Stephens fringe removal photoshop action. My various serches, however, fail to find the action, just lots of comments, and the links all point to http://www.shaystephens.com/ which seem to be a holding page. Can enyone tell me...

a) is it really that good?
b) where I can find a copy to try myself?

Many thanks,
Tom.
Tom Harvey

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dekie View Drop Down
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Post Options Post Options   Quote dekie Quote  Post ReplyReply Direct Link To This Post Posted: 04 June 2009 at 23:37
Look at this site

http://blog.lorrifreedman.com/index.php/2008/07/30/hdr-and-the-purple-fringe/

and download a "Purple Fringe Killer" action at this link:

http://blog.lorrifreedman.com/wp-content/uploads/2008/07/purplefringekiller.zip

It is floating around on the web, and maybe the same as (or as good)
as the Shay Stephen action?

Regards,
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harveyzone View Drop Down
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Post Options Post Options   Quote harveyzone Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2009 at 10:48
Originally posted by dekie dekie wrote:

Look at this site

http://blog.lorrifreedman.com/index.php/2008/07/30/hdr-and-the-purple-fringe/

and download a "Purple Fringe Killer" action at this link:

http://blog.lorrifreedman.com/wp-content/uploads/2008/07/purplefringekiller.zip

It is floating around on the web, and maybe the same as (or as good)
as the Shay Stephen action?


Thanks. I have just downloaded it and will have a play with it.


Edited by harveyzone - 05 June 2009 at 15:07
Tom Harvey

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I Inspiron View Drop Down
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Post Options Post Options   Quote I Inspiron Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2009 at 14:30
Wow, thank you so much for this action. I've always had trouble getting rid of CA. This tool is awesome, no I can use my 28-135 and 80-200 HS without any restriction
Chris
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al View Drop Down
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Post Options Post Options   Quote al Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2009 at 07:18
Does anyone know if there is a similar plugin for Photoshop Elements?
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2009 at 08:07
@ dekie, that's really a killer tip, thanks for posting.

I have the Tamron 70-300 LD macro which is a very good lens except for a horrible purple fringe that is so random it can't be removed with Lightroom and/or PT lens like tools. This one does the job quite well. For instance look at the tail of the pigeon in this shot:

uncorrected:


with fringe killer action:

The only thing you see it also takes out the "genuine" purple in the neck of the pigeon, but that can easily be corrected by editing the layer mask that the tool creates a little bit.

Again thanks !

Edited by pegelli - 07 June 2009 at 08:10
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AnneM View Drop Down
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Post Options Post Options   Quote AnneM Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2009 at 10:07
Why need actions if you can use the standard tools of PS.
You can even do it within the Hue/saturation tool

This technique replaces the magenta color with a lighter gray shade.
It does not completely fix the problem, but it makes it less visible.
And in Piets example you'll get at least the same results!!

1. Open the image to be fixed.
2. Zoom the image to 100%.
3. Choose Image --> Adjust --> Hue/Saturation.
4. Change the color to Magentas.
5. Change the Saturation to -80 and the Lightness to +16.
6. Slowly push the color ramp either up or down the spectrum. Be careful to keep the spectrum in the Magenta level.
7. Move the image around the screen to make sure all the chromatic aberration is eliminated from the whole image.
8. Save the image.

Almost forgotten, it works also in PSE7

Edited by AnneM - 07 June 2009 at 10:12
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dekie View Drop Down
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Post Options Post Options   Quote dekie Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2009 at 12:00
There is no perfect pf tool. They all work with desaturation.

Everything done with an action can be done manually. But there are some advantages with a second layer and a mask layer.

- the mask layer can be edited ( painted) to restore the color in some area's ( the neckt of the pigeon, purple flowers, a purple balloon etc...
- if the fringing is in restricted to a darker or lighter tone range, de blend if option can be used to restrict the correction to this tone range

Manually you can also use the clone tool in color mode to correct the pf to the surrounding color.

Capture one has an auto pf and auto ca removal tool (for raw shooters using C1).

Regards,
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I Inspiron View Drop Down
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Post Options Post Options   Quote I Inspiron Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2009 at 12:27
I too think the added layer is a great help, so you can brush in only the high contrast edges where CA appears and leave the rest of the image unaltered.



Originally posted by dekie dekie wrote:

Capture one has an auto pf and auto ca removal tool (for raw shooters using C1).


Lightroom also has CA-removal tools, but I never got this good results as with the posted action.

Edited by I Inspiron - 07 June 2009 at 12:29
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2009 at 12:55
Originally posted by I Inspiron I Inspiron wrote:

Lightroom also has CA-removal tools, but I never got this good results as with the posted action.


That's because these tools are all designed to correct the CA caused by a uniform directional shift between the colors in the plane of focus. However there's also so-called "bokeh CA" which has a random direction and is centered around light sources. This latter one is very hard to correct except for these selective desaturation type tools/actions.

I agree that the good thing about the photoshop action is the ability to correct the layer mask to get exactly the desired effect in the places you want it, and it doesn't impact the "genuine" magentas in the picture.
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