{"id":3577,"date":"2014-04-30T15:24:48","date_gmt":"2014-04-30T13:24:48","guid":{"rendered":"http:\/\/www.book.artbeeweb.nl\/?p=3577"},"modified":"2014-05-07T21:37:09","modified_gmt":"2014-05-07T19:37:09","slug":"where-do-the-reflection-color-and-value-tables-come-from","status":"publish","type":"post","link":"http:\/\/www.book.artbeeweb.nl\/?p=3577","title":{"rendered":"Where do the Reflection Color and Value tables come from?"},"content":{"rendered":"

Mainly for industrial purposes, the response of light by metals is measured in detail, and published in handbooks, Wikipedia, and the like. Graphs basically look like:
\n\"\"
\nTake Copper for instance. About 37% reflectivity in the blues, 47% in green and up to 80 to 85% in the reds. That might read as RGB = (82% , 47%, 37%) or Hue 14\u00b0 (out of 360) Saturation 55% Brightness 82%. Taking the previous article\u00a0<\/a>in mind, I can use that color and leave value at 100%. Or I can increase the color to 100% brightness (RGB = 255,147,115 or 100%, 57%, 45%) and use the 82% reflectivity for Value. The first approach is preferred, and looks like \"\".<\/p>\n

Anyway, I also can see in the Graph that Gold compared to Copper is a far better reflector in the greens and yellows, and even worse in blue. That makes gold less red, more yellow, and a better overall reflector. Adding Silver for an alloy, a common practice, makes the gold even more reflective and more light-yellow. Silver itself is a very strong reflector in all colors and therefore will show White, while Tin will be slightly less reflective, and will have a very mild greenish taint over it.<\/p>\n

The graph above is quite clear in its interpretation, but I might run into images like
\n\"\"
\nIt\u2019s the same story, but showing light response for a much wider color spectrum. Visible blue matches 400 nano-meter = 0.4 micro-meter while the graph starts at 0.2. And visible red matches 700nm = 0.7\u00b5m while the graph makes it till even 1.2, infra-red heat, well reflected by all metals as we know.<\/p>\n

And the graph adds aluminum, which as I can see reflects slightly stronger in the blues than in the reds giving it a mild bluish taint.<\/p>\n

Next ><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Mainly for industrial purposes, the response of light by metals is measured in detail, and published in handbooks, Wikipedia, and the like. Graphs basically look like: Take Copper for instance. About 37% reflectivity in the blues, 47% in green and up to 80 to 85% in the reds. That might read as RGB = (82% … Continue reading “Where do the Reflection Color and Value tables come from?”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[5],"tags":[145,133],"series":[127],"class_list":["post-3577","post","type-post","status-publish","format-standard","hentry","category-poser","tag-material-room","tag-poser","series-matroom-intermediate"],"_links":{"self":[{"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=\/wp\/v2\/posts\/3577","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3577"}],"version-history":[{"count":5,"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=\/wp\/v2\/posts\/3577\/revisions"}],"predecessor-version":[{"id":4255,"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=\/wp\/v2\/posts\/3577\/revisions\/4255"}],"wp:attachment":[{"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3577"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3577"},{"taxonomy":"series","embeddable":true,"href":"http:\/\/www.book.artbeeweb.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=3577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}