Green and Purple edges

[mmaathuis]

I was shooting last sunday some pictures of sand sculptures on a very sunny day. I wanted to try and mix to photo's together 1 with the correct skylight and one with the foreground properly exposed. It was just a test and I had to handshoot the pictures but when I checked them I found green and puple edges around the foreground sandsculptures.

Is this normal, due to the extreem sunny sky (well extreem for our little dutch country), is there a way to prevent this?

[mmaathuis]

These are the two shots I talked about

[easternherp]

Hi mmaathuis,

Im not too clued up on the ccd side of digital but if this were a tv screen then I would say that the colours are out of alignment and need adjusting. Does this happen with all shots?

[lightwrangler]

Easternherp was on to something with his reaction. I would say that this is most likely chromatic aberation. Which is caused by the lens. If you were to check, it is probably more noticeable at certain aperatures and with certain lenses (I see it the most with my wide angle zoom). It also will change from one lighting situation to another. As far as I know there isn't a fix. This is one of the down sides to using film based lenses for digital capture. It is caused when the different colours of light don't line up exactly at the chip.

[crabby]

Lightwrangler is exactly right. It usually rears it ugly head where the contrast ratio is extreme. Some lenses are better then others. The good news is that it's usually not noticable in the final print. And there's a photoshop plug-in called PT Tools that does an excellent job of eliminating this problem. I know it's available for Macs, I'm not too sure about peecee's.

[easternherp]

Crabby,

Do you have a link to where the photoshop plug in is?

[crabby]

http://www.kekus.com/index.html

[mmaathuis]

Thanx for all your feedback, I was wondering if there was anytrhing wrong with the camera. Now I know this is "normal".

Thanx Crobby for pointing out that there is software available to correct this. Unfortunately, I don't have a MAC. I'll be on the lookout for something like PT tools for the PC.

[mmaathuis]

Ha, With that post I just became a member, cool!