Purple outline on the subjects in my pictures

[nikkisan]

I just took pictures at my son's soccer game, and while reviewing my pictures I am seeing a lot of purple outlines on the kids in the pictures. There is NO purple in the uniform, but there is a lot of purple in the picture. Mostly where there is white. Could anybody tell me what this is and why it happens. Have never really had this before. I shoot with a Canon 7D, and a 70-300mm lens. Thanks.

[mechman]

Originally Posted by nikkisan

I just took pictures at my son's soccer game, and while reviewing my pictures I am seeing a lot of purple outlines on the kids in the pictures. There is NO purple in the uniform, but there is a lot of purple in the picture. Mostly where there is white. Could anybody tell me what this is and why it happens. Have never really had this before. I shoot with a Canon 7D, and a 70-300mm lens. Thanks.

could you post a picture or a link to them? might help

[SusanH1970]

It's chromatic abberation. Happens a lot in areas of high contrast.

http://www.dpreview.com/learn/?/Glos...rration_01.htm

[inkista]

Purple fringe tends to happen when you're shooting with the lens wide open and have a lot of blown highlights. Stop down, and watch your exposure. The easy fix is to de-saturate the purple (assuming there's no purple anywhere else in the image).

CA (chromatic aberration) is when the lens can't focus all the frequencies of light at the same place spatially: there's lateral (or transverse) CA, where you get two "shadows" of different colors on either side (red/cyan and yellow/purple being the most common), and then there's longitudinal (or axial or bokeh) CA (which is what you have here), where the separation is from back to front, so depending on where the focus is placed, you get a color surrounding the image (purple, green, and red being common colors) see: this article.

[candleman]

its already been well answered,
you can use the photoshop SPONGE tool to desaturate the fringed areas.

[BuddhaPi]

Thanx for the tip inks, I have a few images I may be able to salvage that have been sitting around....with a realy nice purpleish halo! (not)

[nikkisan]

Thanks for the help. I tried searching the database, but came up with nothing, as I didn't know what it was called. I was shooting Apeture Prioity, and letting the camera do the rest. What can I do to prevent it in the future?

I am new to this site, and don't know how to put a picture in this thread from my home files, it is asking for a URL when I click on add picture. I also don't have that much knowledge in photoshop. I do have Photoshop elements, but don't really know how to use most of it's features. I like to get the best picture I can out of the camera.

If anyone can tell me how to attach a picture, I would be happy to do so. Thanks for all your comments.
Nikki

[OsmosisStudios]

Originally Posted by nikkisan

What can I do to prevent it in the future?

Adjust the exposure program using exposure compensation.

[inkista]

Originally Posted by nikkisan

Thanks for the help. I tried searching the database, but came up with nothing, as I didn't know what it was called. I was shooting Aperture Priority, and letting the camera do the rest. What can I do to prevent it in the future?

Don't shoot with the lens wide open (at max. aperture).

And watch your exposure for blown highlights. Checking the histogram is a good way to do this.

That's what I meant by "stop down and watch your exposure."