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Topic: Common Buzzard (Read 1574 times) |
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KK Hui
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Common Buzzard
« on: Nov 30th, 2004, 8:32am » |
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MPNR
29/11/04
One of the shots taken yesterday was this Common Buzzard ... 
My thanks to Mike Kilburn for the id!
EOS-1D Mk II, EF600/4L + EF1.4x
Evaluative @ + 2/3, ISO 200
KK Hui ARPS
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Anguslau
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Re: Common Buzzard
« Reply #1 on: Dec 1st, 2004, 6:41pm » |
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Great photo as usual!  
The feather details are unbelievable, tack sharp. Love the color of the sky too - not too blue, just right for my taste!
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| « Last Edit: Dec 1st, 2004, 6:41pm by Anguslau » |
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KK Hui
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Re: Common Buzzard
« Reply #2 on: Dec 2nd, 2004, 9:42am » |
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Thanks for your kind word, Angus!
Have not seen any of your work lately, what's up?!
Best and Good Shooting!
KK Hui ARPS
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Anguslau
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Re: Common Buzzard
« Reply #3 on: Dec 2nd, 2004, 10:04am » |
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Due to personal reasons, haven't been shooting over the last couple of weeks. Hope I can resume next week, and see you in the field...
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Daniel CK Chan
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Re: Common Buzzard
« Reply #4 on: Dec 3rd, 2004, 1:24pm » |
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A great shot, KK! Seems to be a bit blacklighting, right? since I can see some white blue around the body of the bird 
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Daniel CK Chan
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Etta
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Re: Common Buzzard
« Reply #5 on: Dec 3rd, 2004, 1:43pm » |
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Agree, same question as Daniel, and I wonder whether it's the 'Aura' （體光）of the bird. 
Etta
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Webcreeper
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Re: Common Buzzard
« Reply #6 on: Dec 3rd, 2004, 8:59pm » |
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I think that it is an optical illusion. Put your finger or anything dark against any part of the blue background and you will see the same effect.
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bfspoonbill
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Re: Common Buzzard
« Reply #7 on: Dec 4th, 2004, 12:39am » |
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The differences in colour and intensity described by you all are obvious on my cheap cheap Topcon LCD monitor screen and Philips CRT monitor.
As what I commented on 20/11 (KK's imperial eagle) and 25/11 (Owen's kingfisher) in this board, I think.
As said, photos of some others (such as pip.., hand.., dan...) do not have these phenomena.
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| « Last Edit: Dec 4th, 2004, 12:48am by bfspoonbill » |
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KK Hui
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Re: Common Buzzard
« Reply #8 on: Dec 4th, 2004, 7:33am » |
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Thank you all for your input ...
To be honest, I do not see a problem with uneven background color/intensity or halo around the subject here. Neither I've heard any complaint on the issue from other photographic forums I posted. I'm using a CRT mon for my photo editing works by the way ...
KK Hui ARPS
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Daniel CK Chan
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Re: Common Buzzard
« Reply #9 on: Dec 4th, 2004, 10:36am » |
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on Dec 4th, 2004, 7:33am, KK Hui wrote:Thank you all for your input ...
To be honest, I do not see a problem with uneven background color/intensity or halo around the subject here. Neither I've heard any complaint on the issue from other photographic forums I posted. I'm using a CRT mon for my photo editing works by the way ...
KK Hui ARPS
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KK,
Forget to tell that I did see this in my office IBM 17" CRT monitor. I have not opened my home PC/LCD for 2 weeks at least.
Regards
Daniel
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Daniel CK Chan
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Anguslau
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Re: Common Buzzard
« Reply #10 on: Dec 5th, 2004, 12:16pm » |
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I believe the apparent halo is mostly optical illusion due to signal processing by our eyes/brain. They often do amazing things that we did not realise...
Just to "proof" the point, I downloaded kk's image and cut out the eagle, leaving only the blue sky with a white "eagle". From what I can see, the halo is largely gone. There may still be a very slight hint of a "halo", which could be the result of sharpening or local contrast enhancements...
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| « Last Edit: Dec 5th, 2004, 12:21pm by Anguslau » |
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KK Hui
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Re: Common Buzzard
« Reply #11 on: Dec 5th, 2004, 12:45pm » |
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Thanks Angus for the effort!
Having done a minute examination on my post-processing workflow on this image, I found the root cause ... And here is the re-post of the same but with a slightly bigger image size.
The halo or uneven brightness around the subject has now gone for good. The artifact was in fact caused by the use of Highlight/Shadow tools in PScs to 'correct' some extreme contrasty areas.
Hope you see the difference and for the better too ...
KK Hui ARPS
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Webcreeper
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Re: Common Buzzard
« Reply #12 on: Dec 6th, 2004, 3:22am » |
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The illusion is due to Subjective Brightness - colors may change appearance based on the colors surrounding.
Here's a LABORATORY for you to experiment with the various effects.
To simulate the conditions of the buzzard photo:
1. Resize the new window so that you can read these instructions as you go.
2. Set the control sliders for all three elements (2 circles and the background) to the following settings
Hue = 195
Saturation = 70
Brightness = 255
The result should be a pure skyblue background.
3. Decrease the setting of the middle Brightness slider from 255 to 0 - see the halo appearing gradually around the circles.
You may like to experiement with other combinations.
More optical illusions from Project Lite
Have fun!
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Bob Thompson
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Re: Common Buzzard
« Reply #13 on: Dec 6th, 2004, 4:57am » |
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On my Apple 23" HD Cinema Display the shot looks fantastic
Great work KK
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| « Last Edit: Dec 6th, 2004, 5:01am by Bob Thompson » |
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Betty
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Re: Common Buzzard
« Reply #14 on: Dec 6th, 2004, 8:22am » |
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I can see the difference of the repost, the halo is gone.
I find the halo is a kind of sight illusion. If I keep looking at the repost for a longer period and keep thinking if there is light around the body, the illusion though not so obvious will come up to my eyes once again.
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