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Groups > sci.image.processing > #4488
| Subject | Re: spectral cameras |
|---|---|
| Newsgroups | rec.photo.digital, sci.engr.color, sci.image.processing |
| References | (1 earlier) <MPG.38f6fe4558ef051d98d0cb@news.supernews.com> <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> |
| From | geoff <geoff@nospamgeoffwood.org> |
| Date | 2020-04-13 13:16 +1200 |
| Message-ID | <E6idnSyQOYMUIA7DnZ2dnUU7-ffNnZ2d@giganews.com> (permalink) |
Cross-posted to 3 groups.
On 13/04/2020 12:29 pm, 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 > orange > yellow > green > blue > indigo > violet > > That's still quantisation into discrete bands, rather than a truly linear . geoff
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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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