Questions tagged [image-processing]

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6
votes
2answers
323 views

What does “additive fringing from the (multiplicative) twilights” mean?

The question How can I make the fringing pattern visible in my flat (twilight) images for filter i? includes: I have a bunch of twilight flats that have been preprocessed (dark, bias, overscan etc.)...
2
votes
2answers
67 views

How can I make the fringing pattern visible in my flat (twilight) images for filter i?

I have a bunch of twilight flats that have been preprocessed (dark, bias, overscan etc.) and need to remove the additive fringing from the (multiplicative) twilights. I normalized each one by dividing ...
4
votes
0answers
83 views

Converting pixel coordinates to world relative offset coordinates with astropy for plotting

Intro So, I'm having some trouble trying to figure out how I can convert pixel coordinates to world offset coordinates with the center lying on the source coordinates. I would include my fits file ...
1
vote
0answers
51 views

How are small objects automatically identified and their locations determined in digital images?

I have a large quantity of old digital images of low energy electron diffraction (LEED) patterns that I must process to identify and locate small, sometimes elongated gaussian-like blobs of a few ...
0
votes
0answers
18 views

How to use the APARM, BPARM and CPARM of REGRD task in AIPS?

I plan to regrid a 500 by 500 image in B1950 to 500 by 500 in J2000 using the AIPS task REGRD. How to proceed?
16
votes
4answers
3k views

Which are stars and which are noise in this comet photo?

The Forbes news article NASA's Hubble Telescope Snaps Best Images Yet Of Our First Interstellar Comet shows the image below (which I have since annotated) of comet 2I/Borisov (C/2019 Q4) and links to ...
1
vote
1answer
311 views

Converting an RGB image to fits (astropy)

I am trying to save a NumPy RGB array (a 3d array with dimension 512x512x3), to a .fits file using astropy.io. Saving this array to a .png file works fine, but when ...
1
vote
1answer
101 views

False-color wavelength assignments in this “drop-dead gorgeous” image of NGC 2903?

C|Net's Hubble spots drop-dead gorgeous spiral galaxy tucked into Leo links to NASA's Hubble Spots Stunning Spiral Galaxy which shows the image below. The caption on the NASA page doesn't mention the ...
0
votes
1answer
143 views

Why don't we see the gas behind the black hole?

In computer simulations of what a black hole might look like and many artist renderings of black holes, they all seem to show the brightly glowing gas BEHIND the black hole due to gravitational ...
15
votes
3answers
1k views

What is the “lost light” in this unusual Hubble Deep Sky image?

The Daily Galaxy article “The Lost Hubble” –New! Deepest Image of the Universe Ever Taken says: To produce the image a group of researchers from the Instituto de Astrofísica de Canarias (IAC) led ...
2
votes
0answers
63 views

Issue translating World Coordinate system to cartesian coordinate

I have two fits images from the WFC3 that I am trying to combine with a C# program. When I try to combine multiple images I don't think the values I am getting for my x/y coordinates (calculated from ...