Curious About Rainbows.
I just bought PSE 10 and am trying really hard to understand it. I'm really not a book person, but I bought two books on it - just so I can figure out how to edit a photograph. Big learning curve for me. You seem to just flow right thru it.
EstherP wrote:
R.G. wrote:
If my newly installed Google Chrome browser is working, I should be able to upload the pictures in question.
EDIT..... Success.
I like to play... ;-)
Esther
esther this is a very good shot I like the way you got the road in the middle great shot
EstherP wrote:
waterbug49307 wrote:
EstherP - You do amazing work!
Thank you, but
I'll pass the credit to where it belongs: PSE9 !
I've been using PSE since version 9 (and right now am trying to give my son the idea I would like version 11 for Christmas)
To join these two images was as simple as saving them to my hd, opening both in PSE, then selecting New -> Panorama -> open images, click OK, watch the 'puter go through its paces, and there it was.
I've had a lot of fun with panoramas, use them a fair bit in my scrapbooking.
EstherP
quote=waterbug49307 EstherP - You do amazing work... (
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Ummm. For some reason my Elements 10 choked on doing it. I managed to manually paste them together but there were more issues. Oh well.
waterbug49307 wrote:
I just bought PSE 10 and am trying really hard to understand it. I'm really not a book person, but I bought two books on it - just so I can figure out how to edit a photograph. Big learning curve for me. You seem to just flow right thru it.
It is a big learning curve. There are many good reference books but they don't help you get stuff done.
I recommend Kelby and Kloskowski's book. It made me a happy camper in three days after three months of frustration.
Elements 11 is trying to spruce up the user interface. Hope it works.
Just a quick update to say I think I got the answer from the link provided by DaveMM.
If my calculations are correct, the maximum focal length that you could use to capture an entire rainbow in one shot is....
19.9 mm (35 mm equiv.).
If you wanted some clear space at either end of the rainbow, a shorter focal length would be required - say 15 to 16 mm.
So a lens that only went as low as 20 mm would not be quite wide enough (that rules out all the compacts that I know of).
PrairieSeasons wrote:
DaveMM wrote:
R.G. wrote:
I tried to snap a really vivid rainbow when I was on holiday, but the compact that I had with me couldn't go wide enough to capture the whole rainbow in one go. I had to settle for snapping each end separately. I am curious to know what is the maximum focal length that can capture a rainbow in one go.
Ideally the rainbow wouldn't go edge to edge - there would be a bit of clear space all round (that's why I said "maximum focal length" above). I am assuming that rainbows always require the same angle of view (is this right?).
My compact is 28mm equiv at its widest.
I tried to snap a really vivid rainbow when I was ... (
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You are right that rainbows all subtend the same angle of view. This is 42 deg vertically or 84 horizontally. See
http://ffden-2.phys.uaf.edu/211.fall2000.web.projects/Vlada%20P%20Mcghee/RainbowShape.htmlThe lens size depends on the camera. For example, a Canon crop-sensor DSLR (600D) requires a 12 mm lens to subtend 85 deg. See
http://www.howardedin.com/articles/fov.htmlThe way I would take the picture, if I didn't want a panorama, would be to take two or preferably three shots with the camera in portrait mode using my 17 mm lens (27 mm equivalent), then stitch them and crop to 6 * 4 ratio.
quote=R.G. I tried to snap a really vivid rainbow... (
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The other thing you might try is to use a fish eye lens and then use the lens correction filter in Photoshop. I have used that technique with good results, although I have not tried it with a rainbow.
TRIVIA QUESTION: And this one will be easy for small plane pilots - if you see a rainbow from a small airplane, what shape will it be?
quote=DaveMM quote=R.G. I tried to snap a really... (
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Isn't anyone else curious?!? What shape? I'll guess flat.
My guess would be circular, and if the plane cast a shadow, it would be exactly at the centre.
Quite true. It is always a circle, and if you happen to be close enough to a cloud or the ground to see the plane's shadow, it will be inside the circle.
In fact, when that happens (seeing both the plane's shadow and the rainbow), old time pilots would call that a "glory". That term was very common among WWII pilot friends of mine, but that group is diminishing fast.
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TRIVIA QUESTION: And this one will be easy for small plane pilots - if you see a rainbow from a small airplane, what shape will it be?
Is this a trick question? The rainbow would not be seen from above.
[quote=haroldross]
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Is this a trick question?
The circle would appear in the rainclouds in front of you (and slightly below you) with the sun directly behind you.
It's not a trick question, and the rainbows can be seen from a plane. If you google "airplane rainbow" you will see some examples. The examples (at least on the first page) are all taken from large aircraft and through scratchy plexiglass windows so are of marginal quality. The most dramatic ones I've seen have been from a Cessna 182 probably at 6,000 to 8,000 feet AGL.
PrairieSeasons wrote:
TRIVIA QUESTION: And this one will be easy for small plane pilots - if you see a rainbow from a small airplane, what shape will it be?
I'm guessing that might depend on if the airplane was sitting on the tarmac or in the air.
:lol:
lighthouse wrote:
PrairieSeasons wrote:
TRIVIA QUESTION: And this one will be easy for small plane pilots - if you see a rainbow from a small airplane, what shape will it be?
I'm guessing that might depend on if the airplane was sitting on the tarmac or in the air.
:lol:
On the tarmac it looks the same as it would from inside your Chevy. And if your Chevy were 6,000 feet in the air, the rainbow would look like a circle but you would have other potential problems.
PrairieSeasons wrote:
And if your Chevy were 6,000 feet in the air, the rainbow would look like a circle but you would have other potential problems.
Especially if you were seeing a long dark tunnel with a light at the end...
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