NGC 2024 (Flame) and
This is the last of the experimental
shots with the Orion ED-100. After analyzing these pictures with
the help of others in the community and eliminating possible problems
such as poor focus the conclusion was that the Orion ED-100 I was using
did not have the optical quality for the high resolution pictures I was
Alnitak after image integration (linear image)
Therefore this is the last of the
pictures with the ED-100. I have an FSQ-106EDX III on order.
- NGC 2024 (Flame) and B33-
- Processing Details
- Previous Attempt
- Use of MorphologicalTransformation
This photo of NGC 2024 and B-33 was
taken on 11/28
and 12/1 2010. It
consists of 20 exposures of ten minutes each. Processing
done with PixInsight
. This image was unfiltered in city light so there are NIR
components included. The background is degraded by light
This was the other image set taken at the same time as my M33 sequence with the SBig 8300M camera.
Processing this image was considerably more difficult to process than
the M33 image. Once I understood how to reuse PixInsight Process
Containers I found it very easy to experiment. Thus this is the nth version where n is a large number. The picture
still suffers from bloated stars which I am still diagnosing. I
gave up on trying to process the image at 1.2"/pixel so this image was
immediately bined to 2.4"/pixel.
Here is the same image as a PNG
Since the full resolution image is rather large, here are full
resolution closeups of two areas of the image
B33 - Horsehead
One of the challenges is with the 900mm Orion ED-100, the pixel scale
winds up under 2"/pixel so even normal seeing is a problem. For
these images I photographed at 1.2"/pixel, but binned to 2.4" after the
images were combined.
As I said earlier I did a number of experiments to see what the best
order of operations and how to parameterize them. Since I
preserved the PixInsight operations I was able to quickly experiment
with different paths of processing.
T4 Processing details
camera was cooled to -25C.
I published a previous version
on 12/18/10. As a comparision here is NGC2024 and the Horsehead from
the previous versions. These are displayed at the same bin 2x2 as
above. Note the artifacts on the stars.
Much of the result is subjective. The final product is as much a
work of art as science. Hence a lot of the effort goes into
determining what operations in what amounts make the image "better" and
what makes it "worse". The left was a processing step before
deconvolution and stretching radically changed the image. The
middle is the final image. In the image on the right I used an
erosion mask to soft the stars. This was applied after stretching, but
before HDR. I judged this result as "worse" hence it was not
My own preference is to have crisp stars which means using
deconvolution. This effectively deblurs the image. Since
the image required that it argues that the focus was not perfect.
I did try a processing sequence that left out the deconvolution.
That helped the stars some, but deconvolution also brought out detail
in NGC 2024. By not doing it the image of the bright nebula was not as
Copyright 2010, Robert J. Hawley
Some Rights Reserved.
is licensed under a Creative
Commons Attribution-Noncommercial-Share Alike 3.0 United States License.