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



 
 
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  #11  
Old February 23rd 18, 08:59 AM 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 23/02/2018 07:43, RichA wrote:
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?


No they are quite different in concept.

One maps three separate monochrome images to the colour planes R,G,B.
(essentially to show distribution of different narrowband emission)

The colours used may bear no relation to the wavelengths observed.

The other adds colour to what was originally a single pure monochrome
image with the intention of making fine detail visible.

In my book they are both false colour images but usage varies a lot.

--
Regards,
Martin Brown
  #12  
Old February 23rd 18, 05:26 PM posted to sci.astro.amateur
RichA[_6_]
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Default Webb images are not going to be like Hubble's. It'll bebasically monochromatic

On Thursday, 22 February 2018 18:46:28 UTC-5, palsing wrote:
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


Wonder where the blue in the infra-red images came from? Also, resolution is lowers (though of course the Webb is much larger than Hubble) due to being in the IR end of the spectrum.
  #13  
Old February 23rd 18, 07:27 PM posted to sci.astro.amateur
Chris L Peterson
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Posts: 10,007
Default Webb images are not going to be like Hubble's. It'll be basically monochromatic

On Fri, 23 Feb 2018 08:26:29 -0800 (PST), RichA
wrote:

On Thursday, 22 February 2018 18:46:28 UTC-5, palsing wrote:
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


Wonder where the blue in the infra-red images came from? Also, resolution is lowers (though of course the Webb is much larger than Hubble) due to being in the IR end of the spectrum.


Well, in the Carina Nebula image, the data was collected through
narrow band filters, red mapped from the F126N filter (1.26 um, an FE
II line), green mapped from the F128N filter (1.28 um, a H line), and
blue mapped from the F164N filter (1.64 um, another Fe II line).
 




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