Fringing – Color to Greyscale Conversion

BC
Posted By
Brian_Corll
Feb 2, 2008
Views
341
Replies
17
Status
Closed
I converted a landscape image to greyscale using a layer/gradient adjustment. The original color image had very slight fringing at the top of a mountain where the sky meets the trees, but the fringing is much more noticeable in the greyscale image as a white outline in one section of the tree tops. I have tried every method I can think of short of pixel editing to get rid of the fringe but nothing seems to work. Any suggestions ? Googling and searching here didn’t come up with anything helpful.
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color conversion grayscale

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RK
Rob_Keijzer
Feb 2, 2008
Brian,

It’s better to remove the fringing before converting to B/W.

Is the original a Camera Raw file? Then you can do that in ACR. Otherwise try to sample the sky colour, and paint the fringing away with a brush in Color mode.

Rob
BC
Brian_Corll
Feb 2, 2008
Rob,
It’s a JPEG, but I opened it in ACR and tried removing the fringing from the original. It’s definitely cyan fringing, but I can’t get rid of it on either the color or BW side. Driving me crazy, it is.
P
Phosphor
Feb 2, 2008
Can you post a link to the (original, color) file you’re working on?
RK
Rob_Keijzer
Feb 2, 2008
Then I suggest painting in Color mode as I described. I successfully did that a number of times myself.

Zoom in to 400%, sample the sky and paint over the fringe in color mode.

Do this while it’s still in Colour.

BTW, why didn’t it work in ACR? have you tried the Defringe box too?

Rob
BC
Brian_Corll
Feb 2, 2008
Yep, I used the defringe box. Still didn’t work. I guess only Thomas Knoll would know why.
RK
Rob_Keijzer
Feb 2, 2008
Then, as Phos suggested, can we have a go at it?

Rob
BC
Brian_Corll
Feb 2, 2008
OK, guys you’ll find it here:

< https://pa.photoshelter.com/mem/gallery/gallery-show?G_ID=G0 000o_R8JUYiN7U&start=0&pagtotal=1>

Don’t forget, the last guy who made unauthorized usze of one of my images was found at the bottom of the Hudson River with some heavy equipment tied to his feet. 🙂
P
Phosphor
Feb 2, 2008
Did he get to keep the equipment?

I could use a grader and a backhoe…

🙂
P
Phosphor
Feb 2, 2008
BTW…your link leads to a log-in page.

Maybe try uploading it to <http://www.pixentral.com>

If you’re concerned about a rip=off, make sure you set the sharing pref to "Private"
BC
Brian_Corll
Feb 2, 2008
Oops…sorry about that. I’mm new to PSC and don’t have it all figured out yet.

Try < http://www.pixentral.com/show.php?picture=1WiE0ro5tpb0D4psgq ZSrhZ6OALEKc0>
RK
Rob_Keijzer
Feb 3, 2008
There you go.

< http://www.pixentral.com/show.php?picture=1T94gBaZD3QRlLMf7K tYkeraJVr0nJ][IMG]http> ://www.pixentral.com/hosted/1T94gBaZD3QRlLMf7KtYkeraJVr0nJ_t humb.jpg

I removed a lot of fringing on the right side. I used the method I described above.

But there seems to be another problem. Either the camera or you have introduced a rather strong edge contrast with a large radius, giving a halo by definition.

I suspect the camera did this, in the case you actually shoot in Jpeg.

Did you know you will be banned from the forum unless you start to shoot Raw? 🙂

Rob

Edit: I can’t get the Pixentral url in anymore. I’ll put it on my site. Hang on…
RK
Rob_Keijzer
Feb 3, 2008
This ought to do it:

<http://www.faces-and-stuff.nl/Client/fringingcorr.jpg>

Rob
BC
Brian_Corll
Feb 3, 2008
Rob,
The photo was shot in JPG with a Digital Rebel. I now shoot RAW with a Canon 40D. I’m also getting a 1Ds Mark III as soon as Canon decides to release some more. Can’t kick me out now….

Thanks for the link.
RK
Rob_Keijzer
Feb 3, 2008
A Rebel can shoot raw, can’t it?

Can’t kick me out now…

No I can’t. I’m a forum user, like you.

Rob
BC
Brian_Corll
Feb 3, 2008
Yep, the Rebel can shoot RAW. I just was not doing it because I was too cheap to buy a big enough CF card. Got a few 8-giggers now.
MD
Michael_D_Sullivan
Feb 3, 2008
I’m not seeing fringing at the mountaintop; I’m seeing sharpening haloes. If you had shot RAW, you could reduce the sharpening and eliminate this effect. Also, the sharpening in the camera has unduly sharpened some of the cloud edges.

I am seeing fringing at the lower left, at the intersection of the trees and the river, and a lesser amount of fringing at the lower right.
BC
Brian_Corll
Feb 3, 2008
Thanks, Michael. Well with my new equipment it’s RAW all the way for me from now on. I’ve always liked my meat raw anyway. 🙂

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