https://astrob.in/v95b8a/0/OTA: AP 175
Camera: FLI PL16070
Observatory: Deep Sky West
Exposures:
OIII 16 x1800”
Ha 20 x 1800”
SII 14 x1800”
Total Exposure: 25 hrs
Image width ~1 degree
Processed by Alex Woronow (2019-20)
North American Nebula in the region of the “Pelican Nebula”
I hesitate to label this strictly an “artistic rendition” because what you see is really there, just not usually so obvious. Among my many experiments on how to bringmore detail to my images, I experimented with various implementations of a thing called a Sobel Operator. Although most implementations of that operator have been tuned to enhance edges, the operator actually delineates slopes
or gradients in brightness and color. My coding steps back and simply stops at recognizing slopes In effect, this image portrays the first derivative of the parent image. You should think about viewing a mountain at the low
illumination angle of sunset or sunrize--a prime time for photography or painting! This image is similar to that, except in this image the sun sets to the North, East, West, and South, all in the same “painting.”
That is, gradients in all directions become pronounced; consequently, the structure and chaos of the nebula comes to the fore.
Comments always welcomed!
Alex
P.S. I see that this group is becoming just another place to post every image ... Is there some way to discourage that? I posted as a "new topic" to avoid being lost in the array of irrelevant postings. But that's not ideal.
