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Posted on 08/10/08 12:36:49 PM |
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katew
Virtual Virtuoso Posts: 681 Reply  |
This fascinated me ...
It reminded me of the Friday Challenge about refraction, although this one is shadow. The plant is in my kitchen, which faces north east. The photo was taken at around noon. We have an orange roller blind, which was rolled up with a few inches visible at the top of the window. The blind has a rather tarnished brass finish rod along the bottom. I've never seen coloured shadows like these before - does anyone have a scientific explanation as to why there were red and green shadows? (BTW, excuse the converging verticals - I'm too tired to straighten them!) 
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Posted on 08/10/08 3:43:22 PM |
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steve hill
Brain Basher Posts: 228 Reply  |
Re: This fascinated me ...
whatever the cause it make a grat image |
Posted on 08/10/08 4:00:21 PM |
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katew
Virtual Virtuoso Posts: 681 Reply |
Re: This fascinated me ...
Thanks Steve! |
Posted on 08/10/08 9:31:11 PM |
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maiden
Golden Gif Gagster Posts: 471 Reply  |
Re: This fascinated me ...
The red, green and bluish shadows is refraction rather like when sunlight hits rain water the refraction causes a rainbow. I can only presume that the sun is refracting through the leaves and is causing a very compacted rainbow effect if the shadow was further off in the distance you would get a greater spread of colours. But the Red through to Blue parts of the spectrum are there but compacted. That's my best guess. |
Posted on 09/10/08 12:37:22 PM |
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katew
Virtual Virtuoso Posts: 681 Reply |
Re: This fascinated me ...
I think you might be right, Maiden. That sounds feasible to me. |
Posted on 09/10/08 1:38:59 PM |
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tooquilos
Wizard of Oz Posts: 2900 Reply  |
Re: This fascinated me ...
Interesting pic Kate. Looks like one of those 3D images that you wear the red and blue glasses to look at it. |
Posted on 09/10/08 5:21:15 PM |
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katew
Virtual Virtuoso Posts: 681 Reply |
Re: This fascinated me ...
That's what I thought, Anna! Great minds think alike! |
Posted on 10/10/08 01:33:04 AM |
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Babybiker
Shadow Spectaculator Posts: 151 Reply  |
Re: This fascinated me ...
Looking at the effect of the shadows, and particularly the shadow of the trunk, I would guess that this phenomenon was created by multiple light souces. The trunk's darkest shadow is a lot thinner than you would normally expect, pointing towards at least two shadows overlapping. Add to this the different colours of the same shadows for the leaves, and you get the same sort of effect as basic RGB Theatre lighting, just more concentrated. As to where these "multiple" light sources originated from, I am less inclined towards the refraction through the leaves theory (sorry), as these look more like coloured shadows than coloured light casts. Instead it could be that the brass rail on your blind could be, at least partially, causing the effect, especially if it is tarnished,or has a thick laquer on it. The best way to work out the reason behind it would be to try and set up the same shot again, at the same time of day etc, and experiment by eliminating different causes. It is a lovely effect. BB |
Posted on 10/10/08 08:47:27 AM |
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maiden
Golden Gif Gagster Posts: 471 Reply |
Re: This fascinated me ...
That sounds plausible although I wouldn't have thought a metalic surface would have caused this effect, but maybe a crystal or glass object on the window ledge might have. Without seeing it myself it would be difficult to summise but I agree with you about the trunk showing it isn't refraction through the leaves. |
Posted on 10/10/08 09:09:40 AM |
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Steve Caplin
Administrator Posts: 7042 Reply  |
Re: This fascinated me ...
Had it been raining, by any chance? Raindrops on the window? |
Posted on 10/10/08 10:53:12 AM |
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katew
Virtual Virtuoso Posts: 681 Reply |
Re: This fascinated me ...
No, it hadn't rained for a day or two. There's nothing glass or crystal on the window sill, but there is a bottle of liquid soap tucked right in the corner. |
Posted on 12/10/08 05:33:32 AM |
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Nick Curtain
Model Master Posts: 1768 Reply  |
Re: This fascinated me ...
Hmmm, interesting Kate. You can achieve a similar effect by taking three images from slghtly different positions and then splitting the channels in PS. You take the Red from image 1, Blue from image 2 and Green from 3 and then combine into one image. The technique works great on moving skies or water. Nick |