{"id":1408,"date":"2009-04-10T08:00:24","date_gmt":"2009-04-10T08:00:24","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/2009\/04\/how-much-data-is-really-captured-in-a-digital-image.htm"},"modified":"2009-04-10T08:00:44","modified_gmt":"2009-04-10T08:00:44","slug":"how-much-data-is-really-captured-in-a-digital-image","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2009\/04\/how-much-data-is-really-captured-in-a-digital-image.htm","title":{"rendered":"How much data is really captured in a digital image?"},"content":{"rendered":"<p>A few weeks back, <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2009\/03\/using-the-nikon-scan-402-plugin-with-adobe-photoshop-cs3-on-an-intel-mac-running-os-x-105.htm\">I dusted off my Nikon 4000 ED film scanner and scanned some film for some competition entries<\/a>.  I was pretty impressed with the results (once I&#8217;d worked out the best scan settings to use) but confused by the file sizes.<\/p>\n<p>According to <a href=\"http:\/\/www.dpreview.com\/reviews\/specs\/Nikon\/nikon_d70.asp\">Digital Photography Review<\/a>, my Nikon D70 has a 6.0 million <a href=\"http:\/\/www.dpreview.com\/learn\/?\/key=Effective_Pixels\">effective pixels<\/a> from a total of 6.3 sensor sites.  At the largest setting, each image is 2000&#215;3008 pixels (around 6016000 bytes or 5.7MB).  There&#8217;s not an exact match between pixel count and image size (my raw files vary slightly in size but are each around 5.3MB) but we can work on a rule of thumb where each pixel accounts for around 1 byte of uncompressed image data.<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" class=\"alternate\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/nikon-scan.png?w=700&#038;ssl=1\" alt=\"Nikon Scan showing a file size of 65.3MB with a 3946x5782 image\" \/>With the scanner though, things were different: the scan size for a 35mm frame was 5959 x 3946 pixels (around 23514214 bytes or 22.4MB), but the scan sizes reported by my scanning software were 67.3MB for an 8 bit scan and 134.5MB for a 14-bit scan.  I could see that a 14-bit scan would actually use 16-bits (2 bytes) for each pixel but why were the file sizes three times the size they would be for a digital camera sensor?<\/p>\n<p>After a <a href=\"https:\/\/nikoneurope-en.custhelp.com\/app\/account\/questions\/detail\/i_id\/1533816\">lengthy discussion<\/a> with <a href=\"http:\/\/www.europe-nikon.com\/support\/\">Nikon&#8217;s European Customer Support team<\/a>, I found that, whereas the <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2008\/09\/working-with-raw-digital-camera-images.htm\">Bayer mask<\/a> on the digital camera limited each pixel to one colour (red, green or blue) &#8211; and software may be used to interpolate more values if required &#8211; the scanner actually captures three colour values (red, green and blue) for each pixel (instead of measuring the light falling on photo sensor sites and using a mask for the various colours, it shines red, green or blue lights through the film to measure the resulting values for each colour in turn).<\/p>\n<p>On that basis 5959 x 3946 pixels x 3 channels = 70542642 bytes or 67.3MB in 8-bit mode (twice that in 14-bit mode) and the scanning software values suddenly make sense.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A few weeks back, I dusted off my Nikon 4000 ED film scanner and scanned some film for some competition entries. I was pretty impressed with the results (once I&#8217;d worked out the best scan settings to use) but confused by the file sizes. According to Digital Photography Review, my Nikon D70 has a 6.0 &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2009\/04\/how-much-data-is-really-captured-in-a-digital-image.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">How much data is really captured in a digital image?<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[44],"class_list":["post-1408","post","type-post","status-publish","format-standard","hentry","tag-digital-photography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How much data is really captured in a digital image? - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2009\/04\/how-much-data-is-really-captured-in-a-digital-image.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How much data is really captured in a digital image? - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"A few weeks back, I dusted off my Nikon 4000 ED film scanner and scanned some film for some competition entries. I was pretty impressed with the results (once I&#8217;d worked out the best scan settings to use) but confused by the file sizes. According to Digital Photography Review, my Nikon D70 has a 6.0 &hellip; Continue reading How much data is really captured in a digital image?\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2009\/04\/how-much-data-is-really-captured-in-a-digital-image.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2009-04-10T08:00:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2009-04-10T08:00:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.markwilson.co.uk\/blog\/images\/nikon-scan.png\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2009\\\/04\\\/how-much-data-is-really-captured-in-a-digital-image.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2009\\\/04\\\/how-much-data-is-really-captured-in-a-digital-image.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"How much data is really captured in a digital image?\",\"datePublished\":\"2009-04-10T08:00:24+00:00\",\"dateModified\":\"2009-04-10T08:00:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2009\\\/04\\\/how-much-data-is-really-captured-in-a-digital-image.htm\"},\"wordCount\":328,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2009\\\/04\\\/how-much-data-is-really-captured-in-a-digital-image.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/nikon-scan.png\",\"keywords\":[\"Digital Photography\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2009\\\/04\\\/how-much-data-is-really-captured-in-a-digital-image.htm#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2009\\\/04\\\/how-much-data-is-really-captured-in-a-digital-image.htm\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2009\\\/04\\\/how-much-data-is-really-captured-in-a-digital-image.htm\",\"name\":\"How much data is really captured in a digital image? 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Well, it was partly a lack of time - scanning is a time-consuming process and it's only in the last few weeks that I think I've finally cracked the image-scanning process.\u2026","rel":"","context":"In \"Digital Photography\"","block_context":{"text":"Digital Photography","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/digital-photography"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1182,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/09\/working-with-raw-digital-camera-images.htm","url_meta":{"origin":1408,"position":1},"title":"Working with raw digital camera images","author":"Mark Wilson","date":"Saturday 13 September 2008","format":false,"excerpt":"Recently, I went along to one of the meetings of my local camera club, which is something I've been meaning to do for a while but somehow never got around to. At the meeting, one of the members (Andy Gailer) gave a really interesting presentation on working with raw images.\u2026","rel":"","context":"In \"Adobe Digital Negative (.DNG)\"","block_context":{"text":"Adobe Digital Negative (.DNG)","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/dng"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1064,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/05\/not-all-megapixels-are-equal.htm","url_meta":{"origin":1408,"position":2},"title":"Not all megapixels are equal","author":"Mark Wilson","date":"Saturday 10 May 2008","format":false,"excerpt":"I suppose it was enevitable but photographic film products are slowly slipping away. I'd still like a Hasselblad Xpan II, but they are rare (and expensive) - and even if I did get one, I'm not sure that I'd use it (when I bought a DSLR, I kept my film\u2026","rel":"","context":"In \"Digital Photography\"","block_context":{"text":"Digital Photography","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/digital-photography"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1071,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/05\/more-on-high-iso-levels.htm","url_meta":{"origin":1408,"position":3},"title":"More on high ISO levels","author":"Mark Wilson","date":"Tuesday 13 May 2008","format":false,"excerpt":"Chatting with a freind earlier this evening, I realised that I may have confused things slightly when talking about high ISO levels in my post explaining why not all megapixels are equal. Higher ISO film has traditionally been used to take photographs at a higher speed or in poor lighting\u2026","rel":"","context":"In \"Digital Photography\"","block_context":{"text":"Digital Photography","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/digital-photography"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":232,"url":"https:\/\/www.markwilson.co.uk\/blog\/2006\/01\/new-toys-from-nikon.htm","url_meta":{"origin":1408,"position":4},"title":"New toys from Nikon","author":"Mark Wilson","date":"Monday 16 January 2006","format":false,"excerpt":"Although this is mostly an IT blog, one of my hobbies is photography and the two fields are getting ever-closer to one another. I've just picked up my latest toy - an AF-S Zoom Nikkor 80-200 f2.8 IF-ED lens for my Nikon cameras. It's second hand, but it's a really\u2026","rel":"","context":"In \"Digital Photography\"","block_context":{"text":"Digital Photography","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/digital-photography"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":231,"url":"https:\/\/www.markwilson.co.uk\/blog\/2004\/09\/my-leap-into-digital-imaging.htm","url_meta":{"origin":1408,"position":5},"title":"My leap into digital imaging","author":"Mark Wilson","date":"Thursday 23 September 2004","format":false,"excerpt":"This is primarily a technology blog, and it just happens that most of what I work with is IT-related; however one of my hobbies is photography, something which is getting ever closer to IT with the rise in quality and lowering of the costs associated with digital imaging technologies. Last\u2026","rel":"","context":"In \"Digital Photography\"","block_context":{"text":"Digital Photography","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/digital-photography"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1408","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=1408"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1408\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=1408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=1408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=1408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}