06-15-2011, 12:57 PM
[quote name='Pinhole' timestamp='1308139898' post='9257']
Hi Chaps,
All this technical stuff is incredibly fascinating ... but does anyone actually know how to "easily correct" it?
I would guess not in case like this, since there is a major loss of original colour/contrast information on the affected area. When the fringing area is this large, reducing purple saturation will leave an unnatural black/grey halo, and transforming the image to B&W likewise results in a strange grey halo on the nose.
Ian, it looks like you are using a very small part of an image - do you need to crop it so much for real-life usage, or did you only do that to demonstrate the problem?
I ask because this problem often occurs with stage performances, and the best way around it is ultimately to get closer to your subject or use a longer lens - this won't 'cure' it, but it will make the affected area less significant in relation to the size of your image. Also, try experimenting with this type of high contrast/sillhouette shot until you find the optimum settings/situations for you equipment (for example, dark background light subject or subject completely 'blacked out').
[/quote]
You can correct (La)CA, if the lens has a gradual CA character and one of the offending CA colour is a primary colour.
You can not correct PF, but you can mask it. select part of the image that shows PF, and use the replace colour option to change it to whatever suits the area. Pretty simple.
Hi Chaps,
All this technical stuff is incredibly fascinating ... but does anyone actually know how to "easily correct" it?
I would guess not in case like this, since there is a major loss of original colour/contrast information on the affected area. When the fringing area is this large, reducing purple saturation will leave an unnatural black/grey halo, and transforming the image to B&W likewise results in a strange grey halo on the nose.
Ian, it looks like you are using a very small part of an image - do you need to crop it so much for real-life usage, or did you only do that to demonstrate the problem?
I ask because this problem often occurs with stage performances, and the best way around it is ultimately to get closer to your subject or use a longer lens - this won't 'cure' it, but it will make the affected area less significant in relation to the size of your image. Also, try experimenting with this type of high contrast/sillhouette shot until you find the optimum settings/situations for you equipment (for example, dark background light subject or subject completely 'blacked out').
[/quote]
You can correct (La)CA, if the lens has a gradual CA character and one of the offending CA colour is a primary colour.
You can not correct PF, but you can mask it. select part of the image that shows PF, and use the replace colour option to change it to whatever suits the area. Pretty simple.