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04/03/2007 12:35:44 PM · #1 |
I recieved a (perfectly fair - I'm not complaining) comment about the haloing on this image which suggested it was an artefact of oversharpening. Curiously I find that the halo is on the originals and on others taken at the same time - for example
I was shooting JPEGS with the aperture wide to minimise the effect of the bars between me and the lemur. So I was wondering is this effect caused by the bars, by the lemur's fur, the light being slightly towards me, by the narrow dof, a combination of them all or none of the above ? |
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04/03/2007 12:41:22 PM · #2 |
| It's probably mostly a combination of the partial backlighting through the fur (see the thread on contre-jour for more on this) and in-camera sharpening. |
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04/03/2007 12:55:27 PM · #3 |
Originally posted by GeneralE:
It's probably mostly a combination of the partial backlighting through the fur (see the thread on contre-jour for more on this) and in-camera sharpening. |
That is my thought as well. I actually can't even really see the "halo" at all. I wouldn't worry about it.
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04/03/2007 01:13:25 PM · #4 |
Originally posted by thelobster:
I recieved a (perfectly fair - I'm not complaining) comment about the haloing on this image which suggested it was an artefact of oversharpening. Curiously I find that the halo is on the originals and on others taken at the same time - for example
I was shooting JPEGS with the aperture wide to minimise the effect of the bars between me and the lemur. So I was wondering is this effect caused by the bars, by the lemur's fur, the light being slightly towards me, by the narrow dof, a combination of them all or none of the above ? |
The commenter themselves prefaced the remark with, "I'm no expert by any means - but it appears ..."
Looks like the 'halo' is closer to a mirage effect generated by the background lighting than anything else. Theirs obviously is a misinterpretation. In any regard, the effect is a minor component in the composition.
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04/03/2007 01:18:19 PM · #5 |
that would be my comment - as you can see, I am by no means an expert. :)
sorry for the misleading info... |
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04/03/2007 01:25:39 PM · #6 |
Originally posted by krnodil:
that would be my comment - as you can see, I am by no means an expert. :)
sorry for the misleading info... |
Don't be discouraged from leaving comments. Several people were educated, myself included! ;) |
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04/03/2007 01:29:55 PM · #7 |
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04/03/2007 01:36:54 PM · #8 |
Originally posted by krnodil:
that would be my comment - as you can see, I am by no means an expert. :)
sorry for the misleading info... |
I wouldn't consider your comment misleading. It did lead him to the right answer in a round about way. We can't say the same would have happened if you said nothing. Anyway, this turned out to be an informative thread, which might come in handy for some of the contre-jour participants.
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04/03/2007 01:39:35 PM · #9 |
Originally posted by mpeters:
Originally posted by krnodil:
that would be my comment - as you can see, I am by no means an expert. :)
sorry for the misleading info... |
Don't be discouraged from leaving comments. Several people were educated, myself included! ;) |
Agreed! Anyone can make an honest mistake. Believe me, I've made more than my fair share but I didn't have the good sense to say, "I'm no expert...", first. LOL!!!
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04/03/2007 01:43:49 PM · #10 |
That's why I prefaced it with the "no expert" comment - I thought I saw some haloing particularly along the edge of the back of the animal's head and neck, and I had heard how you can get that effect from oversharpening so I thought I'd put it out there in case the information was useful. Wasn't sure myself about it, though, hence the qualification.
originally posted by mpeters:
Several people were educated, myself included! ;)
That's good to know. :)
And, to  thelobster - I just happened to check in and notice this in the forum so I figured I'd own up. :) Don't want you to think I have an ill will or something for mentioning my comment. In fact I think it's great you investigated the suggestion. My observation, wrong or not, didn't factor in to the vote anyway - I still thought it was a great image.
cheers,
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04/03/2007 01:59:13 PM · #11 |
Originally posted by krnodil:
... I had heard how you can get that effect from oversharpening so I thought I'd put it out there in case the information was useful. Wasn't sure myself about it, though, hence the qualification. ... |
You are correct, haloing is most often generated in post processing by oversharpening. That is because 'sharpening' is achieved by adding black pixels on one side of an edge and white pixels on the other side. Generally speaking white pixels against a darker background are more noticeable than the added black pixels... hence the appearance of a 'halo'.
Shadow/Highlight (in Phoroshop CS2) and HDR are two other common post processing techniques used by DPCers that generate noticeable and unrealistic looking 'haloing' in images.
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04/03/2007 03:35:50 PM · #12 |
| Absolutley no disrespect to krnodil or his comment intended - it just made me curious - thanks to all the people who respoded - i learned something |
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