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Guest
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 Posted: Sat Apr 28, 2007 1:08 pm Post subject: Blue and red fringes on white objects toward edge of image |
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In a 3280x2454 RAW image produced by my
Olympus SP-350, reduced by 4 in this
JPEG version,
http://cpacker.org/a1.jpg
the white markers I placed in the
scene as geometric control points on the
left: http://cpacker.org/a2.jpg
and right: http://cpacker.org/a3.jpg
have blue fringes on the edges that
face the center of the scene. This is
chromatic aberration in the lens, right?
--
Charles Packer
http://cpacker.org/whatnews
mailboxATcpacker.org |
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Rutger
Guest
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| Posted: Sat Apr 28, 2007 1:08 pm Post subject: Re: Blue and red fringes on white objects toward edge of ima |
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<mailbox@cpacker.org> schreef in bericht
news:1177763427.717833.137810@h2g2000hsg.googlegroups.com...
| Quote: | In a 3280x2454 RAW image produced by my
Olympus SP-350, reduced by 4 in this
JPEG version,
http://cpacker.org/a1.jpg
the white markers I placed in the
scene as geometric control points on the
left: http://cpacker.org/a2.jpg
and right: http://cpacker.org/a3.jpg
have blue fringes on the edges that
face the center of the scene. This is
chromatic aberration in the lens, right?
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Yes, it is.
Easy to correct with photoshop (filters-distort-lenscorrection) and others.
Rutger
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http://www.flickr.com/photos/zwaarddrager
Rutger |
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Guest
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| Posted: Tue May 01, 2007 12:35 pm Post subject: Re: Blue and red fringes on white objects toward edge of ima |
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On Apr 29, 1:10 pm, Alan Browne <alan.bro...@FreelunchVideotron.ca>
wrote:
| Quote: | In an uncorrected lens red will go towards the center of the image and
blue will go outward.
This is why the left white control shows red on the left (red creeping
rightwards into the white) and vice-versa for the blue.
This is happening everywhere that there are blue and red color
components, of course, but the white triangles show it up.
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Yikes! Now that I know what to look for, I can see the effect on
lots of tree branches. And I'm looking at an image taken in bright
sunlight, where I was able to center the histogram and not overexpose
anything. What a cheesey camera is this SP-350! I guess there'll
be an SLR in my future...
--
Charles Packer
http://cpacker.org/whatnews
mailboxATcpacker.org |
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