天王星 月惑星研究会 関西支部
Uranus Image 2006/09/14(UT)
Here is some research on what you get when you overproces an image.
First I created a disk as the same size of my Uranus images with my C14 on f/33.
Then I overprocessed the image very much and what we see is that at the center
there comes a darker part surrounded by a bright part just inside the cirkle.Outside
the disk a darker cirkle appears.I put it on a grey background so one can see the
Ofcourse in real life we have tubulence of the atmosphere and grain and so on.So
in reality the image gets distorded and there apear to be brightter and darker patches.
Ofcourse , most of these are no details at all but just the result of to much processing.
In a month time I took images in different wavelengts ,- 600nm, 620nm. 700nm and 727nm,-
to study the artefacts that are being produced by overprocessing.Sometimes there seem to be
a slight brighter part at the southern pole of Uranus in the bright cirkle but in the rotation tests
I did on suggestion of John Sussenbach , -where the camera is rotated 90 degrees to see if the
brighter part rotates also,- there was never a clear evidence for it.Other brighter parts in the
bright cirkle rotated also and just took place somewhere at the southern pole and it surroundings.
I did those rotation test on 4 nights.
When leaving out certain parts of the raw images in red or IR, and then combine them with
green and blue images you can create stunning Uranus images as shown in the second image.
(Omission at the following)
Unauthorized use prohibited
[copyright(c)2006 Willem Kivits:Siebengewald Netherlands]