Removing jagged edges?

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Archive 2008 · Removing jagged edges?

floris
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p.1 #1 · Removing jagged edges?

Occasionally in some images I'm find certain diagonal lines have jagged pixely edges, they're there before any sharpening or upsizing... and suggestions on how to get rid of them?

Here's the original at 100%

This image is copyrighted by the owner

And upsized by a factor of 2 and sharpened, at 100%:

This image is copyrighted by the owner

See the pixelation in the twig? Any ideas on how to avoid this from happening? I'm not just picking nits, it shows up in prints and is bothering me. The rest of the image looks fine...

I shoot raw, process in ACR, then PS, flatten, upsize with bicubic (I've tried others, genuine fractals for example, which IMO produces an ugly fractaly effect for natural scenes) and sharpen using various methods. But the problem is that the jaggies are there in the original file after conversion...

Nov 22, 2008 at 09:21 PM

Peano
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p.1 #2 · Removing jagged edges?

I first opened a threshold adjustment layer and adjusted the slider to isolate mainly the white jagged line. I copied that and made a layer mask on a blank layer and filled the layer with white. Then went to Select > Refine edge to tweak the mask a little.

This is your 200% crop upsized another 200%:

This image is copyrighted by the owner

Nov 22, 2008 at 11:02 PM

floris
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p.1 #3 · Removing jagged edges?

Cool, thanks!

Nov 22, 2008 at 11:40 PM

HerbChong
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p.1 #4 · Removing jagged edges?

what camera are you using? this looks like the usual thing that comes out of a camera with an antialiasing filter that is too weak. do other RAW converters show the same problems? if so, your only long term solution is to change cameras.

Herb....

floris wrote:
See the pixelation in the twig? Any ideas on how to avoid this from happening? I'm not just picking nits, it shows up in prints and is bothering me. The rest of the image looks fine...

Nov 22, 2008 at 11:59 PM

floris
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p.1 #5 · Removing jagged edges?

HerbChong wrote:
what camera are you using? this looks like the usual thing that comes out of a camera with an antialiasing filter that is too weak. do other RAW converters show the same problems? if so, your only long term solution is to change cameras.

Herb....

I'm using a 5D, when I can get my hands on a 5DII I'll be upgrading to that.. if it's better it's better, if not it's not.. there's not much choice in terms of affordable high quality FF dSLRs...

I haven't tried any other RAW converters, but I really like the GUI and control in ACR and am very happy with everything else it does..

Nov 23, 2008 at 12:06 AM

GOBHEAD
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p.1 #6 · Removing jagged edges?

One quick way to sort out jagged pixels on diagonals is to use the Blur tool in Photoshop. Just select a small soft brush then shift click on the diagonals to get a nice straight line, give it a try .

Nov 23, 2008 at 11:39 AM

UCSB
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p.1 #7 · Removing jagged edges?

Without your RAW file to really see what is going on it is hard to tell ... in ACR you might try the CA adjustments and fringe adjustments.

Nov 24, 2008 at 09:39 AM


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