{"id":21357,"date":"2021-08-19T01:05:29","date_gmt":"2021-08-19T05:05:29","guid":{"rendered":"https:\/\/phsc.ca\/camera\/?p=21357"},"modified":"2021-08-18T00:19:57","modified_gmt":"2021-08-18T04:19:57","slug":"keeping-an-eye-out-for-colour","status":"publish","type":"post","link":"https:\/\/phsc.ca\/camera\/keeping-an-eye-out-for-colour\/","title":{"rendered":"keeping an eye out for colour"},"content":{"rendered":"
\"\"<\/a>

ad for Curtis colour cameras fall of 1948<\/p><\/div>\n

Toronto<\/strong>. The earliest photographic processes captured only a monochrome image – usually black and white – of the luminance values of the subject. Over the ensuing decades, many efforts were expended to create natural colour<\/a> from the effects of light on the subject.<\/p>\n

The best ideas imitated the action of the human eye. In 1802, Thomas Young had devised a theory of colour vision later revised by Helmholtz. Most successful ideas to capture colour from nature<\/a> stem from the application of the Young-Helmholtz<\/a> theory. Basically, it suggests that the eye has three different kinds of cones each sensitive to a narrow band of the visible spectrum, plus rods which are sensitive to the intensity of light across the visible spectrum.<\/p>\n

One such scheme was to use a single lens\/shutter and split the light in three, passing the beams through filters to a panchromatic media. This idea resulted in the Curtis cameras<\/a> which are depicted in this advertisement from the October, 1948 issue of Popular Photography<\/a>. The registration of three transparencies to create a colour photo was somewhat fussy. Defender offered another solution using its Chromatone process as described in the December 1938 Popular Photography and recorded on the above Curtis cameras<\/a> link for the reader’s convenience.<\/p>\n

A big thanks to my good friend George Dunbar for suggesting the October 1948 advertisement as part of photographic history.<\/p>\n","protected":false},"excerpt":{"rendered":"

Toronto. The earliest photographic processes captured only a monochrome image – usually black and white – of the luminance values of the subject. Over the ensuing decades, many efforts were expended to create natural colour from the effects of light … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1944],"tags":[972,973,398,315,15,3803,3804,914],"class_list":["post-21357","post","type-post","status-publish","format-standard","hentry","category-history","tag-ad","tag-advertisement","tag-camera","tag-color","tag-colour","tag-curis","tag-one-shot-color-cameras","tag-popular-photography"],"_links":{"self":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/21357","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/comments?post=21357"}],"version-history":[{"count":2,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/21357\/revisions"}],"predecessor-version":[{"id":21362,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/21357\/revisions\/21362"}],"wp:attachment":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/media?parent=21357"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/categories?post=21357"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/tags?post=21357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}