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ASTRO: Holmes on the 18th UT reprocessed



 
 
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  #11  
Old November 25th 07, 07:00 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: Holmes on the 18th UT reprocessed

Rick, detail is quite like my images with Larson-Sekanina filter, only
without the ugly artifacts that this filter gives. I have not been able to
extract similar detail with unsharp masking.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...
After seeing what a hard unsharp mask did to Homes in another post here
I went back and tried a moderate one to my 18th image. I hate panda
eyes so stopped before they showed up on the dimmer stars though the
core and a few brighter stars show a mild form of the "disease". It did
though help bring out the streamers in the inner regions.

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".


  #12  
Old November 25th 07, 07:57 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Holmes on the 18th UT reprocessed



Stefan Lilge wrote:

Rick, detail is quite like my images with Larson-Sekanina filter, only
without the ugly artifacts that this filter gives. I have not been able
to extract similar detail with unsharp masking.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...

After seeing what a hard unsharp mask did to Homes in another post here
I went back and tried a moderate one to my 18th image. I hate panda
eyes so stopped before they showed up on the dimmer stars though the
core and a few brighter stars show a mild form of the "disease". It did
though help bring out the streamers in the inner regions.

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".


Strictly speaking I didn't use unsharp masking but a math routine (not
developed by me I just converted it to TTL circuitry) that was developed
for real time audio that does something similar to audio but suppresses
the ringing that created panda eyes visually and causes an audio tone to
ring on long after the pulse stopped.

But I can say it would be about the equivalent of setting Photoshop CS's
unsharp mask to 300% at a radius of about 28 pixels. Then cranking each
down a tad using a rather complicated set of curves (different for both)
and doing it again then again then again for about 100,000 iterations.
Not something most would try.

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

 




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