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Webb images are not going to be like Hubble's. It'll be basically monochromatic



 
 
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  #1  
Old February 22nd 18, 08:55 AM posted to sci.astro.amateur
RichA[_6_]
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Default Webb images are not going to be like Hubble's. It'll be basically monochromatic

It's an infra-red telescope. It will image from orangish to IR, no yellow, no green, blue or violet light. It's mirrors are gold-plated, so the visual images are not going to be the glorious full-spectrum ones we got from the Hubble. This is what you will be seeing:

http://hubble.stsci.edu/webb_telesco...upiter-big.jpg

http://hubble.stsci.edu/webb_telesco...romeda-big.jpg

No doubt NASA, in order not to disappoint people will fake-colour them.
  #2  
Old February 22nd 18, 09:22 AM posted to sci.astro.amateur
Gerald Kelleher
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Default Webb images are not going to be like Hubble's. It'll bebasically monochromatic

On Thursday, February 22, 2018 at 7:55:32 AM UTC, RichA wrote:
It's an infra-red telescope. It will image from orangish to IR, no yellow, no green, blue or violet light. It's mirrors are gold-plated, so the visual images are not going to be the glorious full-spectrum ones we got from the Hubble. This is what you will be seeing:

http://hubble.stsci.edu/webb_telesco...upiter-big.jpg

http://hubble.stsci.edu/webb_telesco...romeda-big.jpg

No doubt NASA, in order not to disappoint people will fake-colour them.


https://jwst.nasa.gov/science.html

From reading this, it is the ultimate testament to theoretical indulgence and everything the Hubble telescope isn't. It is though theorists needed a celestial prop for their celestial sphere musings even if it will have some uses like stellar evolution, the last remaining productive research topic left.

  #3  
Old February 22nd 18, 01:02 PM posted to sci.astro.amateur
Martin Brown[_3_]
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Default Webb images are not going to be like Hubble's. It'll be basicallymonochromatic

On 22/02/2018 07:55, RichA wrote:
It's an infra-red telescope. It will image from orangish to IR, no
yellow, no green, blue or violet light. It's mirrors are


The Webb can image in a range of IR wavebands from near IR bordering on
the visible red orange out to around 30um thermal IR.

They could make false colour images from the different sensor wavebands
with as much validity as combining Red=SII Green=H-alpha, Blue=H-beta
(various other narrowband filter choices are available)

It will be a bit more tricky since the image resolution will vary rather
more with the different wavebands than it does over the visible band.

gold-plated, so the visual images are not going to be the glorious
full-spectrum ones we got from the Hubble. This is what you will be
seeing:

http://hubble.stsci.edu/webb_telesco...upiter-big.jpg


http://hubble.stsci.edu/webb_telesco...romeda-big.jpg

No doubt NASA, in order not to disappoint people will fake-colour
them.


False colour palettes can make faint detail stand out in a monochrome
image that would not otherwise be visible in a basic greyscale. There
are several that preserve luminance information but also add colour.

But if you relax that strict luminance preserving requirement then there
are many special purpose ones intended to make faint detail stand out.

My favourite for maximum visual discrimination with just 256 levels
available is a twisted Hilbert curve of either first or second order.

It goes Black-Blue-Magenta-Red-Yellow-Green-Cyan-White along the edges
of the colour cube with equal visual perceptual steps. It is much better
than spectrum or ironbow for bringing out faint detail on a plateaux.

Pure Hilbert would go Black-Blue-Magenta-Red-Yellow-White-Cyan-Green
(but I think the version with a half twist looks subjectively better)

--
Regards,
Martin Brown
  #4  
Old February 22nd 18, 05:36 PM posted to sci.astro.amateur
Chris L Peterson
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Default Webb images are not going to be like Hubble's. It'll be basically monochromatic

On Wed, 21 Feb 2018 23:55:29 -0800 (PST), RichA
wrote:

It's an infra-red telescope. It will image from orangish to IR, no yellow, no green, blue or violet light. It's mirrors are gold-plated, so the visual images are not going to be the glorious full-spectrum ones we got from the Hubble. This is what you will be seeing:

http://hubble.stsci.edu/webb_telesco...upiter-big.jpg

http://hubble.stsci.edu/webb_telesco...romeda-big.jpg

No doubt NASA, in order not to disappoint people will fake-colour them.


"Fake-color"? The telescope operates, by design, in a non-visible part
of the spectrum. A much broader segment of spectrum than the visible
range. How would you propose such images be displayed? The instrument
does not produce a monochromatic output. Indeed, it has a large range
of filters just like Hubble. (The Hubble camera sensors themselves
are, of course, grayscale devices.)

Images aren't displayed in color to avoid disappointing people, they
are displayed in color because it's the best way to convey visual
information to our eyes.

You have some very, very strange ideas.
  #5  
Old February 22nd 18, 05:40 PM posted to sci.astro.amateur
Chris L Peterson
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Default Webb images are not going to be like Hubble's. It'll be basically monochromatic

On Thu, 22 Feb 2018 12:02:59 +0000, Martin Brown
wrote:

They could make false colour images from the different sensor wavebands...


False colour palettes can make faint detail stand out in a monochrome
image...


These two completely different techniques are often given different
names, with "false color" applying to the first and "pseudocolor" to
the second.
  #6  
Old February 22nd 18, 06:58 PM posted to sci.astro.amateur
Chris.B[_3_]
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Default Webb images are not going to be like Hubble's. It'll bebasically monochromatic

On Thursday, 22 February 2018 08:55:32 UTC+1, RichA wrote:
It's an infra-red telescope. It will image from orangish to IR, no yellow, no green, blue or violet light. It's mirrors are gold-plated, so the visual images are not going to be the glorious full-spectrum ones we got from the Hubble. This is what you will be seeing:

http://hubble.stsci.edu/webb_telesco...upiter-big.jpg

http://hubble.stsci.edu/webb_telesco...romeda-big.jpg

No doubt NASA, in order not to disappoint people will fake-colour them.


Two words: Red shift. ;-)
  #7  
Old February 22nd 18, 11:18 PM posted to sci.astro.amateur
Jibini Kula Tumbili Kujisalimisha
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Default Webb images are not going to be like Hubble's. It'll be basically monochromatic

Paul Schlyter wrote in
:

On Thu, 22 Feb 2018 09:36:07 -0700, Chris L Peterson
wrote:
"Fake-color"? The telescope operates, by design, in a
non-visible

part
of the spectrum. A much broader segment of spectrum than the
visible range. How would you propose such images be displayed?


There's only one way to display images in wavelengths outside
the visible range in "true color": as completely black images.
Because that's what the eyes will "see" in those wavelengths.

And if it can distinguish between different wavelengths of infrared
(and it can), it's not monochrome.

--
Terry Austin

Vacation photos from Iceland:
https://plus.google.com/u/0/collection/QaXQkB

"Terry Austin: like the polio vaccine, only with more asshole."
-- David Bilek

Jesus forgives sinners, not criminals.

  #8  
Old February 22nd 18, 11:24 PM posted to sci.astro.amateur
Paul Schlyter[_3_]
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Posts: 1,344
Default Webb images are not going to be like Hubble's. It'll be basically monochromatic

On Thu, 22 Feb 2018 09:36:07 -0700, Chris L Peterson
wrote:
"Fake-color"? The telescope operates, by design, in a non-visible

part
of the spectrum. A much broader segment of spectrum than the visible
range. How would you propose such images be displayed?


There's only one way to display images in wavelengths outside the
visible range in "true color": as completely black images. Because
that's what the eyes will "see" in those wavelengths.
  #9  
Old February 23rd 18, 12:46 AM posted to sci.astro.amateur
palsing[_2_]
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Default Webb images are not going to be like Hubble's. It'll bebasically monochromatic

On Wednesday, February 21, 2018 at 11:55:32 PM UTC-8, RichA wrote:
It's an infra-red telescope. It will image from orangish to IR, no yellow, no green, blue or violet light. It's mirrors are gold-plated, so the visual images are not going to be the glorious full-spectrum ones we got from the Hubble. This is what you will be seeing:

http://hubble.stsci.edu/webb_telesco...upiter-big.jpg

http://hubble.stsci.edu/webb_telesco...romeda-big.jpg

No doubt NASA, in order not to disappoint people will fake-colour them.


Here is another source that offers comparative photos...

https://jwst.nasa.gov/comparison_about.html
  #10  
Old February 23rd 18, 08:43 AM posted to sci.astro.amateur
RichA[_6_]
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Posts: 1,076
Default Webb images are not going to be like Hubble's. It'll be basically monochromatic

On Thursday, 22 February 2018 11:40:32 UTC-5, Chris L Peterson wrote:
On Thu, 22 Feb 2018 12:02:59 +0000, Martin Brown
wrote:

They could make false colour images from the different sensor wavebands...


False colour palettes can make faint detail stand out in a monochrome
image...


These two completely different techniques are often given different
names, with "false color" applying to the first and "pseudocolor" to
the second.


P.C. names for colouration now?
 




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