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How To Make Diffraction Spikes In Photoshop
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Feb 2, 2016 13:07:35   #
SonnyE Loc: Communist California, USA
 
Oknoder wrote:
IDK, I think Congress does exactly what it's supposed to do, in the most efficient way possible, because what is the opposite of progress?


Humm... Chinese take-out?

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Feb 2, 2016 13:31:23   #
Oknoder Loc: Western North Dakota
 
Naw that would require both effort and personal money.

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Feb 2, 2016 14:09:39   #
Albuqshutterbug Loc: Albuquerque NM
 
Oknoder wrote:
I hate doing inspection from a small phone screen. Looking at ur image, BTW nice capture. since both object that are bright enough to create diffraction spikes show the same type of artifact, only difference is the side of the object. I'll venture a guess it has to do with coma or the field not being flat.

I'm also wondering with your mirrors being perfectly collimated, could it be that your veins are slightly out of whack and you're catching light bleed off from the side your vein.

Damn auto-correct,
Matthew
I hate doing inspection from a small phone screen.... (show quote)



I'll be sure and look for blood when I get home.
;) ;)

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Feb 2, 2016 15:50:46   #
Oknoder Loc: Western North Dakota
 
instead of going back and correcting the words I just typed damn autocorrect, above my signature, but all your guy's jokes have led me to the conclusion I will not be doing that again.

LMFAO,
Matthew

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Feb 3, 2016 01:17:46   #
JimH123 Loc: Morgan Hill, CA
 
nikonshooter wrote:
I get asked about the diffraction spikes in some of my images. Most of them but not all are contrived in photoshop. I have attached a file on "how to" make these. Some folks like them and want to add...some hate them and try to remove. I found this helpful tutorial which comes close to the technique that I use.

For me it depends on the image - since the eye is always drawn to the brightest part of an image - I will add a spike IF A STAR is too bloody bright and ruining the image....I at least try to make it interesting. Which was the case with the Horsehead Nebula.
I get asked about the diffraction spikes in some o... (show quote)


I'm posting an image in which I created star effects using the Stars Plugin from Topaz. It's very easy to do this:

1) Pick a preset -- I used "Starry Night I" which is the least flamboyant.

2) Under Star Settings, pick "Combined". It has the option to throw away everything except what it is going to select, and I don't want that.

Under Main Adjustments:

3) There is a slider for threshold - I can adjust the level of brightness it takes to be affected by this effect. In this case, I adjusted to the point that 7 stars were affected.

4) A slider for Luminance. I could boost the brightness of the selected stars. I didn't.

5) A slider for size. This adjusts the length of the spikes.

6) A slider for angle. I wanted vertical and horizontal spikes.

7) A slider for number of points. I picked 4.

8) A slider for spread. This can grow the stars.

There are also color effects, saturation effects, temperature, secondary points, glow, ring flare.

The image I am including is part of the Auriga constellation. Capella is one of the stars in this constellation, but not this image. I was using a 35mm lens on the Atik Infinity camera and was getting a sense of the size of my field of view.

I see I managed to pick up a jet going overhead as well as something much fainter but perfectly parallel, it also looks like a plane lining up with the airport. Maybe it was a small private plane.

Sample with Star Effects.
Sample with Star Effects....
(Download)

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