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#1
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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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