Purple Fringing

[jjeling]

Im at work right now and will post an image as an example later.

I have one lens that has a problem with this around high contrast areas. There are ways to remove or elp reduce this problem through PP but I have never attempted to fix it and usually just set the images aside. Is there anyone out there that has experienced this problem and dealt with it?

Is it fixed with selective coloring adjustements................??

One thing I do know, is it is best solved by using a different lens. I am getting a new lens in the next couple months but would like to know how to fix the problem with other images I have. They are good images except the purple fringing.. so annoying.

Thanks again.

[Ben H]

I have software that comes with Canon cameras which contains lens profiles, which means the software can automatically remove the fringing based on the pixels and what the metadata says which lens/focal length etc was used.

You can do it manually in many image editing apps though, like Photoshop, which has a "lens correction" filter.

[kat]

Do you mean that look of lens vignette? I have one lens that does that when it's at a certain length and conditions. I just do what Ben H posted.

It can definately be a hinderince (however you spell it) at times!

[jjeling]

Thanks. Ill check photoshop when I get home today. I will also still post an image so I can get a little more input.

[jjeling]

Here is one of the images that was ruined by the purple fringing. I opened up photoshop and checked out my filters, there was nothing in there dealing with lens corrections. Probably because Im still using CS2.

Is there any other way to deal with this?

[Marko]

I have to be honest - I'm not seeing what you are referring to. Where exactly are you seeing this fringing?

[kat]

I don't see anything purple either? Except for around the ball cap?

[Rinkdaddy]

I don't see the purple either.

[tirediron]

There is distinct purple fringing around the perimeter of the subject's hat, but it seems fairly minor. I'm not sure if CS2 has this capability (Filters > Distortion > Lens correction (I think) ). As far as alternate methods, it's a difficult thing to fix, but you can try selecting the area and using the colour-balance control.

[jjeling]

yep, its around the hat. Maybe its just me expecting perfection, but it is quite bad in the full version. Remember, uploading through the forum degrades the image quality so maybe that has something to do with it. The NCAA championship is coming up the last week in May and I want to have this under control by then. The new lens should fix that, but would still like to know how to fix it in PP too. Also, landscapes of the course are sometimes ruined when there is fringing around the flag. Just some minor technical issues that prevent images from being in the upper echelon of quality. :wall-an:


TI, thanks for that input. Im going back home again to check it out.

[Marko]

I see it now. Thx.
.....and i would definitely never use that lens again if it were mine. You just never know where the fringing will show up and that would freak me out.

[jjeling]

I see it now. Thx.
.....and i would definitely never use that lens again if it were mine. You just never know where the fringing will show up and that would freak me out.

No kidding. Not reliable at all. It was one of those el cheapo tamron's. I couldnt have spent more than $200 on it. It is a 70-300mm with a macro function. It is great under extremely specific conditions. That is about it. If those conditions are not right, then the lens stays off. The macro function is nice to have. It is more of a practice lens though. The only real images that have ever come from this were the images of the iguana's.

It is extremely weird. I pull the same shutter speed at f5.6 and f45 at at any given focal length. I need more light at f11-f25 than other aperture settings. Its a toy more than anything and could care less if I dropped it and it broke.

[Marko]

Sounds broken to me, let's wish it fairwell then..if possible:cry-an:

[Mad Aussie]

That's a nice case of chromatic aberation you got there JJ. All lenses suffer from it to some degree I think but it's more obvious in cheaper lenses. It occurs at the borders of very bright pixels where they meet dark pixels.
Shoot in RAW if you think this will happen and use the RAW editing software like Lightroom or whatever to correct it where possible.

[Marko]

I agree with this MA but

"It is extremely weird. I pull the same shutter speed at f5.6 and f45 at at any given focal length. I need more light at f11-f25 than other aperture settings. Its a toy more than anything and could care less if I dropped it and it broke."

this lens ALSO sounds broken.

[Mad Aussie]

I agree with this MA but

"It is extremely weird. I pull the same shutter speed at f5.6 and f45 at at any given focal length. I need more light at f11-f25 than other aperture settings. Its a toy more than anything and could care less if I dropped it and it broke."

this lens ALSO sounds broken.
Oh yes, I wasn't arguing that something wasn't wrong with the lens. Just stating what that effect was.

[Mad Aussie]

I should add that the fringing was immediately obvious to me on my screen.

[Alex Wilson]

It really shows up on my monitor -- not just around the hat, but around the head of the club too. Definitely avoid that lens if you're shooting anything bright.

[F8&Bthere]

I'm a bit late to the party, but FWIW...

This ties in nicely to my complainin' about Pentax lens price increases in another thread. Pentax has it's fair share of CA problems. Just check out reviews at photozone.de

I see some purple fringing in your photos and I also see it in many of my photos with certain lenses. I tried correcting it in lightroom but often it's too much for the LR CA correction tool even. Other programs like DXO Optics and PTLens do these kind of lens corrections as well, but I think DXO won't have presets for as many Pentax body/lens combos as for Canikon. PTLens may be better from what I've read in the Pentax forums.

I never tried the Pentax/Silkypix software long enough to see if it offered any lens corrections. Might be worth a try, since you prob already have that software for free. Look for some tool or adjustment called Chromatic Aberration.

[Barefoot]

I see some purple fringing in your photos and I also see it in many of my photos with certain lenses. I tried correcting it in lightroom but often it's too much for the LR CA correction tool even.

There is a fairly quick fix in PS if it’s not real bad. This image is borderline as the head of the club can be salvaged, but the area around the cap is a little tougher. There is still remnants of CA visible there.

Image>adjustments>hue/saturation. Select magentas from the edit box and place the eye dropper over an offending area of the image and click. Slightly decrease the hue and drop the saturation until the purple disappears. It's a global adjustment, so no matter where you choose to place the eye dropper, the effects of CA should disappear through out the entire image. You may have to use the magnification tool to get a good placement of the eye dropper on the purple fringe. Sometimes you have to select blues in the edit box as an additional step, but separately.

This method does not eliminate the border occupied by the effects of CA, but it does make it much less noticeable.