{"id":898,"date":"2024-05-14T08:50:38","date_gmt":"2024-05-14T08:50:38","guid":{"rendered":"https:\/\/lasala1.com\/en\/?page_id=898"},"modified":"2024-05-21T09:56:52","modified_gmt":"2024-05-21T09:56:52","slug":"digital-noise-in-film-scan-preservation","status":"publish","type":"page","link":"https:\/\/lasala1.com\/en\/digital-noise-in-film-scan-preservation\/","title":{"rendered":"Digital noise in film scan preservation"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Subtracting digital noise in preservation film scans without degrading image data<\/h1>\n\n\n\n<p>Rethinking how to implement strategies to improve film scan digitizations image&#8217;s quality without negatively affecting them with averaging filtering processes, I fell into the use of a <em>well-known<\/em> data processing technique that will help address the inherent and sometimes&nbsp;undesirable relationship between any existent <strong>digital image<\/strong> and the <strong>digital noise<\/strong>. Yes, I&#8217;m talking about <strong>Image Stacking<\/strong>.<\/p>\n\n\n\n<p>Although it is really present in all areas of the digital image, it&#8217;s in the image&#8217;s darker areas where digital noise shows it&#8217;s force with an <em>artistically<\/em> random contribution to the resulting image as a <em>grainy texture<\/em> that becomes more evident, especially, if we lift up the exposure in any color grading workflow.<\/p>\n\n\n\n\t\t\t\n\t<style type=\"text\/css\">\n\t\t.slider-info-1067.bafg-slider-info .bafg-slider-title {\n\t\t\t\t\t\t\tfont-size:\n\t\t\t\t\t&quot;12px&quot;\t\t\t\t;\n\t\t\t\n\t\t\t\n\t\t\t\t\t}\n\n\t\t.slider-info-1067.bafg-slider-info .bafg-slider-description {\n\t\t\t\t\t\t\tfont-size:\n\t\t\t\t\t&quot;12px&quot;\t\t\t\t;\n\t\t\t\n\t\t\t\n\t\t\t\t\t}\n\t\t\n\t\t\n\t\t.slider-info-1067.bafg-slider-info .bafg_slider_readmore_button {\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\ttext-align: center;\n\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\t\t}\n\n\t\t.slider-info-1067.bafg-slider-info .bafg_slider_readmore_button:hover {\n\n\t\t\t\n\t\t\t\n\t\t\t\t\t}\n\t<\/style>\n\t\n\t\t\t<div class=\"bafg-twentytwenty-container slider-1067  \"\n\t\t\t\tbafg-orientation=\"vertical\" bafg-default-offset=\"0.5\"\n\t\t\t\tbafg-before-label=\"Standard SNR\"\n\t\t\t\tbafg-after-label=\"Enhanced SNR\" bafg-overlay=\"1\"\n\t\t\t\tbafg-move-slider-on-hover=\"\"\n\t\t\t\tbafg-click-to-move=\"\">\n\n\t\t\t\t\t\t\t\t<img class=\"skip-lazy\" data-skip-lazy\t\t\t\t\tsrc=\"https:\/\/lasala1.com\/en\/wp-content\/uploads\/2024\/05\/NoisyShadowsCrop.png\" alt=\"Standard SNR\">\n\t\t\t\t<img class=\"skip-lazy\" data-skip-lazy\t\t\t\t\tsrc=\"https:\/\/lasala1.com\/en\/wp-content\/uploads\/2024\/05\/DenoisedShadowsCrop.png\" alt=\"Enhanced SNR\">\n\n\t\t\t<\/div>\n\n\t\t\t\t<div class=\"bafg-slider-info-wraper\">\n\t\t<div style=\"\" class=\"slider-info-1067 bafg-slider-info\">\n\t\t\t\t\t<\/div>\n\t<\/div>\n\t\n\t\t\t<style type=\"text\/css\">\n\t\t\t\t\t\t\t\t\t\t\t<\/style>\n\t\t\t\n<figcaption class=\"wp-element-caption\">\n<div style=\"font-size: 0.75em; text-align:center;\">\nExposure was lifted up dramatically to show digital noise present on dark areas.<br>Standard scanning mode vs 8K DCI RAW image stacking scanning mode.\n<\/div>\n<\/figcaption>\n\n\n<h3 class=\"wp-block-heading\"><strong>Trusting reliable information only<\/strong><\/h3>\n\n\n\n<p>Different concepts arise here, but to simplify I&#8217;ll refer to the <strong>signal-to-noise ratio (<a href=\"https:\/\/en.wikipedia.org\/wiki\/Signal-to-noise_ratio\" target=\"_blank\" rel=\"noreferrer noopener\">SNR<\/a>)<\/strong> concept as it&#8217;s closely related with digital noise. Random <strong>digital noise<\/strong> present in digital images increases as the <strong>SNR<\/strong> ratio decreases. Think about an underexposed digital image as a typical low <strong>SNR<\/strong> ratio example. But, even if we have managed to apply the digital sensor <strong>ISO<\/strong> optimal values and proper scene exposure times, some sort of <strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Image_noise\" target=\"_blank\" rel=\"noreferrer noopener\">electronic noise<\/a><\/strong> will appear, in any case, in the resulting image as an undesirable by-product of the present electronic technology limitations.<\/p>\n\n\n\n<p>Good news are that some types of digital noise may be addressed -without averaging nearby pixels or smoothing filtering processes that negatively impact on image details and the genuine film grain-, by <strong>improving the SNR<\/strong> with image stacking. The stacking process recovers the signal and reduces noise by a factor of <em><kbd>1\/sqrt(Number Of Samples)<\/kbd><\/em>. It&#8217;s our choice wich enhancement level do we want to achieve and how to apply this technique accordingly. As a result, not only we&#8217;ll get a more detailed and cleaner image with better quality and more faithful to reality, but perhaps most significantly, we will avoid <strong>preserving digital film<\/strong> files with undesirable random noise information in our <strong>film archives<\/strong> and <strong>cinematheques<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>New scanning mode: 8K DCI RAW image stacking<\/strong><\/h3>\n\n\n\n<p>With all of this in mind the <strong><a href=\"https:\/\/lasala1.com\/en\/35mm-film-scanner-8k-raw\/\" data-type=\"page\" data-id=\"440\">NoGap 2D Film Scanner 8K RAW system<\/a><\/strong> has been upgraded and besides the <em><strong>standard scanning mode<\/strong><\/em>, currently allows to work in <em><strong>image stacking mode<\/strong><\/em>. Now, the <em>scanner technician<\/em> can choose to scan from 1 up to a massive 9 stacked <strong>8K DCI 14-bit RAW<\/strong> samples per frame. Once scanning project is complete, the new toolset will automatically process all the stacked <strong>RAW images<\/strong> and generate an enhanced <strong>denoised RAW<\/strong> image per frame in <strong>DNG<\/strong> format. The denoised frame will take up the same storage space as any other <strong>DNG<\/strong>, like those from a <em><strong>standard scan project<\/strong><\/em>, but will contain more accurate information thanks to the stacked <strong>RAW<\/strong> files. Calculations are performed directly on <strong>RAW data<\/strong>, without any pre\/post processing, at a <strong>64-bit floating point precision<\/strong> to allow an accurate ingestion of the huge numbers present in the images stack. The resulting <strong>14-bit DNG<\/strong> image discards unnecessary random noise measurements from the <strong>RAW data<\/strong> -information that doesn&#8217;t really exist in the scanned film- and can be preserved directly, involved in <strong><a href=\"https:\/\/lasala1.com\/en\/8k-raw-workflows-for-digital-film-restoration\/\" data-type=\"page\" data-id=\"816\">8K RAW digital film restoration workflows<\/a><\/strong>, or, if needed, converted to other formats such as 8, 10, 12, or 16-bit <strong>TIFF<\/strong>, <strong>EXR<\/strong> or <strong>DPX<\/strong> in <strong>ACES color space<\/strong> for more traditional workflows.<\/p>\n\n\n\n<p>Want to know more? Don&#8217;t hesitate to get in touch at: <a href=\"mailto:nogap2Dfilmscan@lasala1.com\">nogap2Dfilmscan@lasala1.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Subtracting digital noise in preservation film scans without degrading image data Rethinking how to implement strategies to improve film scan digitizations image&#8217;s quality without negatively affecting them with averaging filtering processes, I fell into the use of a well-known data processing technique that will help address the inherent and sometimes&nbsp;undesirable relationship between any existent digital &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/lasala1.com\/en\/digital-noise-in-film-scan-preservation\/\" class=\"more-link\">Continuar leyendo<span class=\"screen-reader-text\"> \u00abDigital noise in film scan preservation\u00bb<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":992,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-898","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/pages\/898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/comments?post=898"}],"version-history":[{"count":121,"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/pages\/898\/revisions"}],"predecessor-version":[{"id":1099,"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/pages\/898\/revisions\/1099"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/media\/992"}],"wp:attachment":[{"href":"https:\/\/lasala1.com\/en\/wp-json\/wp\/v2\/media?parent=898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}