The Image Index is a system based on likes received on images, that incentivizes the most active and liked members of the community. Learn more.
The Contribution Index (beta) is system to reward informative, constructive, and valuable commentary on AstroBin. Learn more.
Description:
2020 08 17 Iris Dust from the cabin
Iris Nebula in Cepheus imaged over 3 nights Aug 14-16 (new moon) from the cabin
C8 EdgeHD Hyperstar FL=400 w ZWO ASI294MC Pro on Paramount MyT (unguided)
Total of 515x60s subs (T=-15C, gain=130, offset=30) mostly from the night of Aug 15
Calibration frames: 30x60s dark; 30x2s flat; 30x2s flat-dark
Processed in PixInsight 1.8.8-5 Aug 18
Calibrated, cosmetic corrected, debayered, subframe selected & wtd for median, FWHM, ecc, SNR
Integrated best 364 frames (6 hours exposure at f/2!)
Photometric color correction
Automatic Background Extraction
Light histogram stretch to nonlinear
Nonlinear processing followed Old Wexi tutorial :
https://www.dropbox.com/s/dw6imbwpq8brvdt/Howto_enhance_nebuala_without_pushing_stars.wmv?dl=0
Clone nonlinear image to "original" and "starless"
Process "starlesss" clone:
REDUCE SMALL STARS:
StarMask scale=7, growth=3, small=1, comp=2 smooth=8 & apply
Mukltiscale Median Transform layers=6 diasble 1-4 (up to 8 pixels scale) apply TWICE (just to stars)
REDUCE MEDIUM STARS
Morphological Transformation Erosion apply twice (just to stars)
Remove star mask
REDUCE LARGE STARS
Use Range Selection (lower limit) to isolate biggest stars but not nebulosity
Iterate three or more times, making them big and smooth
Apply to starless image
Use HDR Multiscale Transform (5 layers) on big stars only (multiple iterations?)
EXPONENTIAL TRANSFORMATION OF STARLESS IMAGE IN PIXELMATH
With big stars masked off
RGB/K = 1-(1-$T)*(1-$T) to everything but big stars
COMBINE STARLESS & ORIGINAL IMAGES IN PIXELMATH
F=0.4 (or whatever)
RGB/K = (1-(1-$T)*(1-s)*F) + ($T * ~F)
Apply to original
Repeat as needed with smaller F (e.g., F=0.2)
Tweak histogram between each exponential stretch to eliminate left shoulder (don't clip shadows at all)
Final histogram and curves tweaks
=======================
Dusty dirty universe!
Space is just chock full of dirt. Some might say "ewww" but hold on -- don't clean it up -- it's important.
This is an actual photo of a huge expanse of dust in the constellation Cepheus (the King of Ethiopia) taken over the weekend from our cabin in Wyoming. It's more than 6 hours of exposure over three crystal clear nights at 10,500 feet elevation at the dark of the Moon.
Everything in the universe that's not hydrogen or helium gas is made from dust. Every grain of sand. Every crystal of rock. Every blade of grass. Every flower, every feather, every drop of water and flake of snow.
Everyone you love and everyone you don't.
It's made inside of stars and it's left in great clots and clods along the plane of the galaxy as the spiral arms churn through the gas with their waves of creation and destruction.
The dirt is cold and brown and sooty and greasy. It's full of carbon and oxygen, nitrogen and sulfur. The deep cold lets gas coalesce around it and self-gravitate into new stars.
Swirling space dirt is left behind when new stars blow the gas away, and scrunches down to melt and meld and separate into planets and plants and people.
Huzzah for the filthy fecund universe that brings forth such glory!
Uploaded: ...
This page or operation is not available at the moment, because AstroBin is in READ ONLY mode. For more information, please check out our Twitter feed: https://twitter.com/AstroBin_com
This feature is only offered at higher membership levels.
Would you be interested in upgrading? AstroBin is a very small business and your support would mean a lot!
This feature is only offered at the AstroBin Ultimate membership level.
Would you be interested in upgrading? AstroBin is a very small business and your support would mean a lot!
Only group members can post in a group's forum.
Please join or request to join the group, and then you'll be able to post a new topic.
If this user has been harassing you, and you shadow-ban them, all their activities on your content will be invisible to everyone except themselves.
They will not know that they have been shadow-banned, and the goal is that eventually they will get bored while having caused no harm, since nobody saw what they posted.
This operation will reload the current page. If you have any unsaved information in a form, it will be lost.
You can also dismiss this window, and your operation will be applied at the next page navigation.
This operation cannot be undone!
When you report abuse on some content on AstroBin, the content will be hidden until a moderator reviews it. Abuse reports are anonymous and the content's owner will not be notified.
Please specify a reason for this abuse report.
Please note: The following tables are updated every 24 hours.
Distinct awarded users | Total awarded images | |
---|---|---|
Image of the day | ||
Top picks | ||
Top pick nominations |
Image of the day | Top pick | Top pick nominations | Total submitted | |
---|---|---|---|---|
Deep sky | ||||
Solar system | ||||
Extremely wide field | ||||
Star trails | ||||
Northern lights | ||||
Noctilucent clouds | ||||
Landscape |
Image of the day | Top pick | Top pick nominations | Total submitted | |
---|---|---|---|---|
Backyard | ||||
Traveller | ||||
Own remote observatory | ||||
Amateur hosting facility | ||||
Public amaeteur data | ||||
Professional, scientific grade data | ||||
Mix of multiple sources | ||||
Other | ||||
Unknown |
Please note: You are on a Free account, and when you delete an image, your upload counter does not decrease (unless the image is deleted within 24 hours of uploading it). The Free account is not a way to keep your most recent or best 10 images on AstroBin, but a trial period for you to decide whether or not a paid subscription is worth it. For more information, please click here.
The image will be permanently deleted and cannot be recovered. All its revisions will be deleted too. Are you sure?
You will delete all other revisions (if any), and the originally uploaded image, leaving the current revision as the final and only version of this image.
You will delete all revisions, leaving the originally uploaded image as the final and only version of this image.
The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.
Submitted The date and time when you submitted this image for IOTD/TP consideration. | ... |
---|---|
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew. | |
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected. | |
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status. | |
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members. |
This image cannot be submitted for the IOTD/TP consideration.
Reason:
You are not authenticated. Please log in.
Comments