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Smailholm Tower


angelpeak

From the category:

Architecture

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Nice composition. You have got the same issue with this image that I have come across when posting some of mine i.e. a halo effect (clearly visible around the top of the tower which disappears once the frame is open fully. I post images from a Canon EOS 40 D and a Canon EOS 5D. The issue seems to arise more often from the 40D sourced images. Do you, or anyone else have an explanation? Best regards Stephen
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The 'halo' effect or pixel aberrations you refer to have no real bearing on the camera or lens used but has more to do with the jpeg compression used by PN to produce the smaller image. I see it a lot, especially where there is high contrast or where there is a well defined boundary between light and dark areas. As you say, it vanishes in the full size picture and there is not much you can do about it. (except to produce files that are small enough to avoid compression by PN). You can replicate this effect quite easily by saving an image in jpeg at 12 (PS minimum compression) and then save another copy at say 3. This makes a really nasty mess of the boundary areas! Regards, Tony.
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Thanks for the explanation Anthony. Ihave removed several images because of this artifact as Iassumed that it was a processing problem. I have a Photostream on Flickr and cannot say I have noticed this problem on that site. At least I now know what the issue is. Regards Stephen
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