Need a little help...

[barrie]

Here is a photo I took that I think is pretty decent:
http://farm1.static.flickr.com/129/363802764_1775afcd91.jpg

As I looked at it more closely, I noticed a purple glowing line along the left edge of the building, just on the white parts. I know there is a name for this but I can't think of it right now. My question though is how do I avoid this on future shots?

You can see the purple edge better if you look at the larger version of the photo on flickr: http://www.flickr.com/photo_zoom.gne?id=363802764&size=l

Oh - and is there a way to remove it without messing up the photo too much?

[googlit]

is that the Disney castle in Florida, or somewhere else? I used to live a couple hours away, so we'd go all the time. :)

anywho, I would take it into Photoshop and work on the glow very carefully with a clone stamp (sampling from the dark sky). Using the clone will help the colors & texture blend better. There may be an easier way, but as long as you're pretty careful, I think it's definitely do-able without ruining the pic. Once you've eliminated most of the glow, it will probably still be purplish on the edges, so you could select those areas, feather the selection, and desaturate it until it looks a little more natural.

hope I'm not completely unhelpful. :)

[googlit]

haha, nevermind... after glancing thru your other pics, that's definitely WDW. very nice shots, btw. :)

[Nicole]

As I looked at it more closely, I noticed a purple glowing line along the left edge of the building, just on the white parts. I know there is a name for this but I can't think of it right now. My question though is how do I avoid this on future shots?


Your shot is the victim of chromatic aberration (http://en.wikipedia.org/wiki/Chromatic_aberration). There was a discussion of this in the Nikon D50 Users (http://flickr.com/groups/nikond50/discuss/72157594505761910/) Flickr group just a few days ago. Basically, what was said was that the aperture was the biggest contributer to CA (Chromatic abberation). This article on CA (http://wiki.panotools.org/Chromatic_aberration) is way more technical, but explains it much more fully than the wikipedia article. So, what you can do in the future is stop down the aperture a bit and try to expose for the highlights (e.g. use the little blinky feature).

Great shot by the way :)

[barrie]

Thanks both of you. I knew someone here could help me out. Oh, and yes, the castle is from Disney World in Florida.

[jrossh21]

Don't know if you have Photoshop or not, but there is a CA correction window in: Filter>Distort>Lens Correction ... near the top right there's a slider for blue/yellow. Don't know how well it works, but it might help you.

[barrie]

Don't know if you have Photoshop or not, but there is a CA correction window in: Filter>Distort>Lens Correction ... near the top right there's a slider for blue/yellow. Don't know how well it works, but it might help you.


Thanks for the tip. I tried it but it didn't change that line at all. I did notice the change it was making on other parts of the photo though.