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How to make an Earth sized circle for your prom

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#1 pjr200

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Posted 08 April 2009 - 10:30 AM

1)Create a large document- 3000x3000 pixels.

2) Make a large circle, I have used the rulers to make it 30x30 units.

3)Copy and paste the image of your prom, it should now be in a separate layer.

4) Select the circle layer and click Edit>Free transform.

5)Click the link icon in between the W 100% and H100% icons at the top. This allows the rescaling of an object to be the same in both the x and y axis.

6) Rescale the circle until the curvature of both the circle and limb on your image match up (this will take a bit of trail and error and is a bit easier if you alter the transparancy of the prom image).Rescaling is done by clicking a corner of the box that now surrounds the circle. Once they match up, the circle now represents the relative size of the Sun to your image.

7)The Sun is about 108 times larger than the Earth. So we need to rescale the circle so that it is 108 times smaller. Select the circle and click edit>free transform. In the tool bar at the top again click the link icon and enter in one of the boxes either side 0.93%. This will rescale the circle to make it the relative size of the Earth.

8) Move the Earth circle over the image of your prom. Then use the crop tool to remove the surrounding area around your image.

You should now have a circle which can be copy and pasted for any other image as long as you have used the same imaging setup e.g. cameras and barlows


Here are a few images that may help.

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#2 pjr200

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Posted 08 April 2009 - 10:30 AM

.

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#3 pjr200

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Posted 08 April 2009 - 10:31 AM

..

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#4 pjr200

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Posted 08 April 2009 - 10:32 AM

...

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#5 pjr200

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Posted 08 April 2009 - 10:32 AM

,

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#6 ragebot

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Posted 08 April 2009 - 10:41 AM

Thanks. This is a sticky candidate.

#7 Sol

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Posted 08 April 2009 - 11:25 AM

Nice easy tutorial to follow and well presented too - thanks :waytogo:

Mark

#8 darkstar528

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Posted 08 April 2009 - 12:12 PM

Very kewl, thank you for that!...

#9 EmielVeldhuis

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Posted 08 April 2009 - 12:49 PM

Very handy tutorial, Paul!
Can I post it on SolarLive for others to use?
Name mentioned ofcours! ;)

greetz emiel

#10 pjr200

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Posted 08 April 2009 - 12:56 PM

Thanks everyone. Emiel, feel free to post it on solarlive :)

#11 EmielVeldhuis

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Posted 08 April 2009 - 04:40 PM

Thanks Paul!

#12 ZielkeNightsky

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Posted 08 April 2009 - 05:56 PM

Thanks Paul. It works great and very easy to do. Just swapped the cirlce with a Nasa image of Earth.

#13 DavidM

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Posted 09 April 2009 - 12:32 AM

Thanks Paul,
I was wondering how to go about doing this.

#14 spaceydee

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Posted 09 April 2009 - 05:07 PM

Thank you Paul, I have added a link to this thread in the solar tips sticky near the top of the solar forum

#15 pjr200

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Posted 09 April 2009 - 06:21 PM

Thanks everyone, Thanks Dee.






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