{"id":1832,"date":"2018-01-19T15:35:46","date_gmt":"2018-01-19T15:35:46","guid":{"rendered":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/?p=1832"},"modified":"2020-04-09T15:53:25","modified_gmt":"2020-04-09T15:53:25","slug":"fun-with-photodoc-infrared-edition-7","status":"publish","type":"post","link":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/2018\/01\/fun-with-photodoc-infrared-edition-7","title":{"rendered":"Fun with PhotoDoc: Infrared (Edition 7)"},"content":{"rendered":"<p>At the end of last year the lab purchased a modified UV-Vis-IR Nikon through <a href=\"https:\/\/www.maxmax.com\/\">MaxMax<\/a> so that we can start to play around with infrared photography.\u00a0 Infrared photography (IR) is commonly used in fine art conservation as an examination tool.\u00a0 Reflected IR can be helpful when\u00a0trying to identify pigments, inks, coatings, etc. and transmitted IR can helpful\u00a0for viewing watermarks, underdrawings, and linings. We&#8217;ve only just started dabbling with IR photography, but I wanted to share some photos from my most recent session with reflected IR.<\/p>\n<p>This is a full leather photo album from the Public Library of Cincinnati &amp; Hamilton County&#8217;s collection.\u00a0 This early 1900s photo album contains hand-colored silver gelatin photographs taken by A. Nielen.\u00a0 \u00a0The photographs appear to depict his travels through the US and Canada, and various landmarks and neighborhoods of Cincinnati are represented.<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 50%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-1832 gallery-columns-2 gallery-size-medium'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/2018\/01\/fun-with-photodoc-infrared-edition-7\/i86659790_1510_a01n'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"193\" src=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_A01N-1-300x193.jpg\" class=\"attachment-medium size-medium\" alt=\"i86659790_1510_A01N\" aria-describedby=\"gallery-1-2772\" srcset=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_A01N-1-300x193.jpg 300w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_A01N-1-1024x660.jpg 1024w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_A01N-1-768x495.jpg 768w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_A01N-1-1536x991.jpg 1536w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_A01N-1-2048x1321.jpg 2048w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_A01N-1-624x402.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-2772'>\n\t\t\t\tBefore treatment\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/2018\/01\/fun-with-photodoc-infrared-edition-7\/i86659790_1510_d01n'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"194\" src=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D01N-1-300x194.jpg\" class=\"attachment-medium size-medium\" alt=\"i86659790_1510_D01N\" aria-describedby=\"gallery-1-2773\" srcset=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D01N-1-300x194.jpg 300w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D01N-1-1024x661.jpg 1024w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D01N-1-768x496.jpg 768w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D01N-1-1536x992.jpg 1536w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D01N-1-2048x1322.jpg 2048w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D01N-1-624x403.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-2773'>\n\t\t\t\tAfter treatment\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<p>This seemed like a good object for reflected IR because of the hand-coloring on the photographs and the white ink inscription below each photograph.\u00a0 I began by taking a representative visible light image (first image below) using our modified UV-Vis-IR camera, incandescent lighting, and the <a href=\"https:\/\/www.maxmax.com\/shopper\/product\/15100-xnitecc158-x-nite-cc1-filter-in-58mm-diameter-x-2mm-thick\/category_pathway-9221\">X-Nite CC1<\/a> filter on our 50mm lens.\u00a0 Then, being careful not to move the position of the camera or the object, I switched to the <a href=\"https:\/\/www.maxmax.com\/shopper\/product\/15089-xnite83058-x-nite-830nm-filter-in-58mm-diameter-x-2mm-thick\/category_pathway-9222\">X-Nite 830<\/a> filter (830nm) and converted that image to grayscale in Photoshop (second image below).\u00a0 Then I took my visible light image and my reflected IR image into Photoshop to create the false-color image (third image below).\u00a0 The digital false-color image is a combined representation of the visible and infrared images, and it&#8217;s actually quite simple to make.\u00a0 You basically copy and paste the various channels for the VIS and IR image as follows, green to blue, red to green, and IR to red.\u00a0 The false-color image allows you to better differentiate and characterize the various materials (pigments, inks, etc.) and potentially even identify them if you have sufficient known samples to use as references.<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-2 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-2 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-2 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-2 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-2' class='gallery galleryid-1832 gallery-columns-3 gallery-size-medium'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/2018\/01\/fun-with-photodoc-infrared-edition-7\/i86659790_1510_d10vis'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"276\" src=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10VIS-1-300x276.jpg\" class=\"attachment-medium size-medium\" alt=\"i86659790_1510_D10VIS\" aria-describedby=\"gallery-2-2776\" srcset=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10VIS-1-300x276.jpg 300w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10VIS-1-1024x941.jpg 1024w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10VIS-1-768x706.jpg 768w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10VIS-1-1536x1411.jpg 1536w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10VIS-1-2048x1882.jpg 2048w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10VIS-1-624x573.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-2-2776'>\n\t\t\t\tNormal illumination\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/2018\/01\/fun-with-photodoc-infrared-edition-7\/i86659790_1510_d10ir_830'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"276\" src=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IR_830-1-300x276.jpg\" class=\"attachment-medium size-medium\" alt=\"i86659790_1510_D10IR_830\" aria-describedby=\"gallery-2-2774\" srcset=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IR_830-1-300x276.jpg 300w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IR_830-1-1024x943.jpg 1024w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IR_830-1-768x707.jpg 768w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IR_830-1-1536x1415.jpg 1536w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IR_830-1-2048x1886.jpg 2048w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IR_830-1-624x575.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-2-2774'>\n\t\t\t\tNear infrared with wavelength at roughly 830nm\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/2018\/01\/fun-with-photodoc-infrared-edition-7\/i86659790_1510_d10irfc'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"276\" src=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IRFC-1-300x276.jpg\" class=\"attachment-medium size-medium\" alt=\"i86659790_1510_D10IRFC\" aria-describedby=\"gallery-2-2775\" srcset=\"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IRFC-1-300x276.jpg 300w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IRFC-1-1024x943.jpg 1024w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IRFC-1-768x707.jpg 768w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IRFC-1-1536x1415.jpg 1536w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IRFC-1-2048x1886.jpg 2048w, https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-content\/uploads\/2018\/01\/i86659790_1510_D10IRFC-1-624x575.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-2-2775'>\n\t\t\t\tFalse color\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<p>Like I said, we&#8217;ve only just started using IR and we&#8217;ve got a long way to go, but I&#8217;m looking forward to experimenting and learning more about it as time goes on.<\/p>\n<p><strong>Jessica Ebert (UCL) &#8211; Conservation Technician &amp; Photographic Documentation Tech<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>At the end of last year the lab purchased a modified UV-Vis-IR Nikon through MaxMax so that we can start to play around with infrared photography.\u00a0 Infrared photography (IR) is commonly used in fine art conservation as an examination tool.\u00a0 Reflected IR can be helpful when\u00a0trying to identify pigments, inks, coatings, etc. and transmitted IR [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,1],"tags":[126,135,148,163,171,252,279],"class_list":["post-1832","post","type-post","status-publish","format-standard","hentry","category-photograph","category-uncategorized","tag-false-color","tag-fun-with-photodoc","tag-hand-colored-photographs","tag-infrared","tag-jessica-ebert","tag-public-library","tag-silver-gelatin"],"_links":{"self":[{"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/posts\/1832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/comments?post=1832"}],"version-history":[{"count":3,"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/posts\/1832\/revisions"}],"predecessor-version":[{"id":2778,"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/posts\/1832\/revisions\/2778"}],"wp:attachment":[{"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/media?parent=1832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/categories?post=1832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/libapps.libraries.uc.edu\/thepreservationlab\/wp-json\/wp\/v2\/tags?post=1832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}