redeye
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The effects of 'red eye'

Postby redeye » Mon Dec 06, 2010 9:28 pm

Hello my name is Maddie.
I am doing my project on the effects of red eye. I have a few questions. I am deciding between; the subjects eye color, the angle the picture is taken at in relation to the eyes, or the lighting in the area for my variables. Which one do you think is the best? Do you have any other ideas? Also, depending on the variable you recommend, what would be the best way to conduct this experiment. Also, I was wondering if you know any good sites that I could use to conduct my research? My research is due very soon and I am out of ideas for sources. And, if I found a written article on red eye on the internet, what should i cite it as; an internet resource or an article. Thank you for your help. Do you have any tips or other knowledge of red eye that could be useful in my project??

Thanks :)

ivogougheschrich
Former Expert
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Re: The effects of 'red eye'

Postby ivogougheschrich » Tue Dec 07, 2010 11:24 am

Hi Maddie,

consider the practical implications of your variables. If you choose eye color, you will need to come up with several different people to conduct your experiment. If you choose angle to eyes or ambient lighting, you only need one helper.
As for the internet resources on red-eye effect, I agree with you there aren't many useful sites out there. The Wikipedia article is the most organized one I could find, however it is not well referenced.
If the article you found has been published, e.g. it has a journal or book reference for itself, I think you can cite it as article. If all you have is its URL then it is an internet resource.

redeye
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Joined: Mon Dec 06, 2010 8:55 pm
Occupation: student 8th grade

Re: The effects of 'red eye'

Postby redeye » Tue Dec 07, 2010 10:16 pm

Thankyou for responding. So, eye color ruled out, which do you think would be a better project, easier to test; angle or lighting? :?:

If wikipedia is the only website that has good information what should I do? isn't wikipedia frowned upon by science and history fair judges?? :(

Thank you for the citing information. I think i will put it under internet. 8)

Thanks again. :lol:

Craig_Bridge
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Re: The effects of 'red eye'

Postby Craig_Bridge » Wed Dec 08, 2010 3:35 pm

"red eye" effect in images usually originates from a flash. If the flash is close enough to the camera lens, then the light from the flash will enter the pupils of the subject and reflect off the blood vessels in the retina of the eyes and come back out the pupils and enter the camera lens. If you consider the similar isosceles triangles made by the flash pupil, camera lens and the smaller one in the eye, it is a matter of geometry to determine if the angle is such that the reflection can be seen by the camera lens.

The typical ways professional photographers prevent the "red eye" effect is to move the flash off camera (increase the base of the triangle) so the flash reflection of people looking directly at the camera doesn't make it back to the camera lens, have the subjects look at something like a helper so they are looking away from the camera/flash, bounce the flash off the ceiling or wall, or eliminate the flash and use ambient lighting.

The color of the iris has almost nothing to do it; however, the size of the pupil (dark ambient causes big pupils which increases the placements where red-eye occurs)

Unfortunately, if the subject is looking directly at the midpoint between the flash and the camer lens, they maximize the chance of "red eye".

If you don't have a camera with a separate flash, you will be limited in what you can investigate.
-Craig

redeye
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Joined: Mon Dec 06, 2010 8:55 pm
Occupation: student 8th grade

Re: The effects of 'red eye'

Postby redeye » Wed Dec 08, 2010 11:29 pm

Thankyou for responding Craig. Could anyone tell me which do you think would be a better project and easier to test; angle or lighting?

If wikipedia is the only website that has good information what should I do? isn't wikipedia frowned upon by science and history fair judges??

Thankyou.

staryl13
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Re: The effects of 'red eye'

Postby staryl13 » Fri Dec 10, 2010 7:12 pm

Hi,
Yes, you are right! Wikipedia definitely should not be your primary source, so I tried to find some sources for you:

http://sirl.stanford.edu/~bob/pdf/EyeTr ... _ivc00.pdf

http://74.125.155.132/scholar?q=cache:P ... t=40000000

Hope these help, good luck!
"There is a single light of science, and to brighten it anywhere is to brighten it everywhere." -Isaac Asimov

redeye
Posts: 4
Joined: Mon Dec 06, 2010 8:55 pm
Occupation: student 8th grade

Re: The effects of 'red eye'

Postby redeye » Sat Dec 11, 2010 9:35 pm

thank you so much! the second one was the most helpful! :D


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