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Artist James Bridle calls them "Rainbow planes" and has used this in his art. Rainbow Plane 002: Kiev. October 29, 2014: https://booktwo.org/notebook/rainbow-p
by Jiocus 5y ago
Artist James Bridle calls them "Rainbow planes" and has used this in his art.
Rainbow Plane 002: Kiev. October 29, 2014: https://booktwo.org/notebook/rainbow-plane-002-kiev/ https://booktwo.org/notebook/rainbow-plane-002-kiev/
Rainbow Planes: https://www.flickr.com/photos/stml/sets/72157637938061015/ https://www.flickr.com/photos/stml/sets/72157637938061015/
- djmips 5y agoDoes anyone have a theory on why some photos have a rainbow plane and a solid white place offset?
- kqr 5y agoThey take a separate high-res monochromatic picture. (As image compression theory tells us, if you can afford to sacrifice some colour resolution for monochromatic resolution -- do it.)
- mcdonje 5y agoIt's interesting how some satellites take the alpha channel pic before the RGB channels, and some do it after. The lag also changes. Alpha & RGB have similar lags for some, but alpha is way off on others.
- defaultcompany 5y agoWhat does alpha channel mean in this context? Usually it means transparency but how would you take a picture of that?
- dagmx 5y agoDo you mean luminance? Alpha usually refers to the transparency channel in an RGBA image. Whereas I believe you're describing more of a YUV setup
- robocat 5y ago“Rather than taking a photograph, satellite sensors record electromagnetic radiation in the red, blue, green, and high-resolution panchromatic (black-and-white) bands (as well as several not visible to the human eye, as this Mapbox[2] post helpfully explains). When these bands are combined to produce a visible image, fast-moving objects – like planes in flight – don’t quite match up, producing the rainbow effect. [2] https://blog.mapbox.com/putting-landsat-8s-bands-to-work-631c4029e9d1 https://blog.mapbox.com/putting-landsat-8s-bands-to-work-631...
- Phrodo_00 5y ago> Rather than taking a photograph, satellite sensors record electromagnetic radiation in the red, blue, green, and high-resolution panchromatic (black-and-white) bands (as well as several not visible to the human eye, as this Mapbox[2] post helpfully explains). When these bands are combined to produce a visible image That's the same as taking a (normal, digital) photograph (sans additional non-rgb layers), just explained.
- ihattendorf 5y agoThe difference is typical digital cameras have a bayer filter in front of the sensor to allow taking a single color picture vs. here it sounds like multiple captures with individual filters (e.g. 1 blue, 1 red, 1 green, 1 monochrome) that are later combined into a color picture.
- wodenokoto 5y agoThe point was at all color photos record electromagnetic radiation in visible colors. The “it doesn’t take photos it record electromagnetic radiation” is a silly thing to say.
- daniel_reetz 5y agoThere's some subtlety here. Colors are percepts- phenomena that happen in the brain. Wavelengths and radiation describe natural electromagnetic phenomena, not percepts. Example: Infrared has no "color". It's possible to induce the illusion of colors in the absence of light altogether. I appreciate that the article took care with this language, as it's a deep and fascinating topic.
- keymone 5y agoReminds me of when Russia tried to blame Ukraine for downing the MH17 by producing a satellite image of the plane being chased by a jet fighter and even capturing the moment of launching the missile. Of course none of the moving objects had any sign of the color shifting. https://nationalpost.com/news/russian-satellite-image-of-mh17-being-shot-down-by-fighter-jet-dismissed-as-crude-fake https://nationalpost.com/news/russian-satellite-image-of-mh1...
- phreeza 5y agoWell it's a b&w image so...