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Do clowns hold the door open for you as a nice jester?
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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They can't make up their minds, they keep running in circus.
GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
If you think 'goto' is evil, try writing an Assembly program without JMP. -- TNCaver
"When you have eliminated the JavaScript, whatever remains must be an empty page." -- Mike Hankey
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It's hard to big top that.
/ravi
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Make up your mind! Last time[^], you were holding the door open for them! 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Did OG just rip-off his own joke? 
The United States invariably does the right thing, after having exhausted every other alternative. -Winston Churchill
America is the only country that went from barbarism to decadence without civilization in between. -Oscar Wilde
Wow, even the French showed a little more spine than that before they got their sh*t pushed in.[^] -Colin Mullikin
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He Leslied himself - and that definitely sounds like a euphemism! 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Quote: He Leslied himself
No that one he repeated for non native like me to give also us a Chance
modified 19-Jan-21 21:04pm.
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Get in your car (with the 27 others).
Mongo: Mongo only pawn... in game of life.
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They could only be doing it because of pierrot pressure.
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Naw, they just do it for laughs...
Will Rogers never met me.
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Here 3
====
Hear ye, here comes the sun of a gunboats and trains and plain and tall woman in a black avenger of the Spanish Main Traveled Road less Travels with Charley McCarthy hearing aid and abetcha by golly wow did you hear
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Adobe[^] has a decent high level summary of how NASA scientists use their software to assemble the images we love from collections of grayscale images, or dozens of non-aligned snapshots.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Interesting. So all these APOD photos really wouldn't be "that" special without an human artist to help. Interesting.
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As are many citometric views of cells. It's saddening, at least for me, because I do not like lies. I like fiction, not lies.
GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
If you think 'goto' is evil, try writing an Assembly program without JMP. -- TNCaver
"When you have eliminated the JavaScript, whatever remains must be an empty page." -- Mike Hankey
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Lies? Not taking sides but giving a food-for-thought that I had to grapple with.
I was scanning negatives from family outings. Some were taken in a forest. Now in those days, film didn't have a white-balance setting: you had either indoor film or outdoor film, almost invariably, the latter, balanced for tungsten filament or sunlight.
Well - photos taken with a tree canopy were always rather greenish. So, when scanning them, how do I balance the color: what the films sees, with it's bias towards coloration lit my standard sunlight or what my eyes saw, which had adjusted to the greenish light and thus perceived items in their 'normal' colors? Which is correct - at least philosophically? The light was, in fact greenish . . . but that's not what I saw.
I finally opted for balancing the images to normal colors, where normal is the white-balance magic done by our eyes.
So, apply the above to the images from space: is it lies? fiction? or possibly even closer to the truth then the photos show? The answer could depend upon the attitude and instructions given to the one recomposing the images - but a 3-dimensional reality projected into two dimensions, with colors lit by light other than the standard 'sol' source: not really an obvious answer.
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "As far as we know, our computer has never had an undetected error." - Weisert | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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I like your point of view. The difference between the representation and the object, or "Ceci n'est pas une pipe" as a more relevant individual said before me.
Thanks for sharing your insight 
GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- ++>+++ y+++* Weapons extension: ma- k++ F+2 X
If you think 'goto' is evil, try writing an Assembly program without JMP. -- TNCaver
"When you have eliminated the JavaScript, whatever remains must be an empty page." -- Mike Hankey
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Exactly. What cameras see is *NOT* the same as what your eyes see or could see. Even if the color balance is right our eyes are logarithmic sensors while cameras are basically linear sensors (likewise for film); meaning that they can't handle the same range of contrast as our eyes do in a single exposure. Your computer screen has a dynamic range of 1-256, the sensor on your camera spans a range of a few thousand, your is is IIRC something like 100k to 1M before pupil size adjustments.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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The people doing them at NASA are scientists who know how to use adobe's tools, because (aside from the Hubble Heritage image every year) they're taken for scientific purposes first and foremost; the cameras aren't designed to make pretty pictures out of the box; you get a bunch of RAW files that need even more work than what comes out of your DSLR before they look presentable.
Even ignoring false color (IR/UV/Xray or narrow band) images your baseline images are all taken with a monochrome sensor with sequential exposures with red, green, and blue filters in place (and for fainter objects often a much longer one without any filter at all); also in many cases instead of a single exposure in each channel you take a bunch of shorter ones so you can throw out any bad ones instead of trying to fix them in post (eg vibrations smudging things, your target drifting because you didn't have the scope perfectly aligned, etc). Afterwards you've got a set of HDR raws with the interesting variations in contrast often in several disparate segments of the range: near the top for stars (assuming they aren't all overexposed and blown out) and somewhere in the middle for nebula or distant galaxies. In cases with even greater contrast spreads you might have exposures of differing durations to avoid blowing out the brightest objects while still getting the dimmest above the noise floor; in which case you'll have more than just the baseline 12/16 bits of HDR to compress (generally non-linearly) into a good image.
Images taken with space telescopes will also need to have streaks from cosmic rays edited out; those on the ground may have streaks from satellites, aircraft, or meteors although unlike cosmic rays they're often rare enough you can just toss one or two of several dozen frames and ignore them. Excluding some consumer telescope designs, you'll also have diffraction spikes on bright stars from the holder for your secondary mirror. The example in the Adobe article processed them out, but some people prefer to have them in.
None of this is to say you can't just hang a DSLR off the end of a telescope and still get better results than pros did with giant scopes 30 years ago (at this point I wouldn't be surprised if even a smartphone would top old film results); but the processing in DSLRs is optimized for different use cases; meaning you're at a disadvantage vs people working with dedicated astro-imaging cameras.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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I think the "photos" are great, I really do, but I always have to ask myself, what is real and what was pulled out of scientists asrse. Just saying.
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25 years for a book sounds about right. The first generation of digital sensors went to space in the 60's. 1990 was plenty of time for all the techniques to get developed, although I'm curious if they'd made their way down to Photoshop from software that makes Adobe licenses look cheap. I'm blanking on the name, but the program I used in a 2002 lab astronomy course cost something like 5 or 10x as much as Photoshop did at the time.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Does that astronomy software exist today? Or, is it bought-over by the photo shopping guys? 
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It was some sort of very high end generic image processing tool not a specific tool for astronomers; and since I'm blanking on the name I obviously can't answer the second question.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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