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Groups > sci.image.processing > #4490
| From | dale <dale@dalekelly.org> |
|---|---|
| Newsgroups | rec.photo.digital, sci.engr.color, sci.image.processing |
| Subject | Re: spectral cameras |
| Date | 2020-04-13 17:24 -0400 |
| Message-ID | <d2vaqk.q8m.19.1@news.alt.net> (permalink) |
| References | (2 earlier) <d2ffna.40s.19.1@news.alt.net> <d2gcnq.6hm.17.1@news.alt.net> <MPG.38f82819692d38c098d0ce@news.supernews.com> <d2t1b6.a12.17.1@news.alt.net> <dsCdnQ8HaYi6TgnDnZ2dnUU7-c_NnZ2d@giganews.com> |
Cross-posted to 3 groups.
On 4/13/2020 5:01 PM, Alan Browne wrote: > On 2020-04-12 20:29, dale wrote: >> On 4/8/2020 1:28 PM, Alfred Molon wrote: >>> In article <d2gcnq.6hm.17.1@news.alt.net>, dale@dalekelly.org >>> says... >>>> back to resolution ... >>>> >>>> the visible spectrum >>>> >>>> https://en.wikipedia.org/wiki/Visible_spectrum >>>> >>>> is from 380nm-720nm wavelengths >>>> >>>> if you sample that in 10nm increments, that a low end spectrometer 20 >>>> some years ago for approx $10K would do ... >>>> >>>> wouldn't you need 34 dots per pixel? In printing and publishing a >>>> typical rosette pattern CMYK pixel requires 8 dots ... >>> >>> It wouldn't be a good idea to split up each pixel into 34 >>> subpixels, each only capturing a very narrow wavelength range. >>> >>> Most incoming photons would not be used, i.e. the sensor would >>> have a low spectral efficiency. >>> >> >> what about analog capture through a prism then digital rendering in >> the camera's software driver to the seven optical wavelength colors? >> >> https://en.wikipedia.org/wiki/Prism#/media/File:Light_dispersion_conceptual_waves.gif >> >> >> red > <s> > > Everything is trade space. If you sample wider spectrally then you'll > likely be under sampling spatially. Further contribution to noise as > well from each discrete sampling location. > > IAC, whether today's cameras are RGB, RGBh or CYGM they seem to capture > the colour range more than adequately enough. > RGBW might be something to consider since for example pink hues require R and W, that would be R and (RGB) -- Minister Dale Kelly, Ph.D. https://www.dalekelly.org/ Board Certified Holistic Health Practitioner Board Certified Alternative Medical Practitioner
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spectral cameras dale <dale@dalekelly.org> - 2020-04-07 15:05 -0400
Re: spectral cameras Alfred Molon <alfred_molon@yahoo.com> - 2020-04-07 22:17 +0200
Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-07 17:09 -0400
Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-08 01:24 -0400
Re: spectral cameras Alfred Molon <alfred_molon@yahoo.com> - 2020-04-08 19:28 +0200
Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-12 20:29 -0400
Re: spectral cameras geoff <geoff@nospamgeoffwood.org> - 2020-04-13 13:16 +1200
Re: spectral cameras Alan Browne <bitbucket@blackhole.com> - 2020-04-13 17:01 -0400
Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-13 17:24 -0400
Re: spectral cameras Alan Browne <bitbucket@blackhole.com> - 2020-04-13 18:58 -0400
Re: spectral cameras Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2020-04-09 08:42 +0100
Re: spectral cameras Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2020-04-08 07:51 +0100
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