{"id":777,"date":"2011-08-07T10:59:11","date_gmt":"2011-08-07T15:59:11","guid":{"rendered":"http:\/\/analyze3d.com\/Site\/?page_id=777"},"modified":"2014-11-15T12:16:38","modified_gmt":"2014-11-15T17:16:38","slug":"hdr","status":"publish","type":"page","link":"https:\/\/analyze3d.com\/Site\/hdr\/","title":{"rendered":"HDR"},"content":{"rendered":"

HDR is High Dynamic Range<\/h2>\n

\"Mount<\/p>\n

DSLR cameras have come a long way.\u00a0 Dark and bright situations can be captured better than ever before.\u00a0 Because cameras have gotten smarter, you wouldn’t know by looking at many of the pictures taken that they have significant limitations.\u00a0 One considerable limitation of today’s cameras is their dynamic range.\u00a0 They can capture scenes will with highlights or shadows… but usually not both.\u00a0 At least not well.\u00a0 The scene taken above is an example of a scene which confronts this limitation.\u00a0 No combination of settings for the D300 could capture the dock, water, and sky in the scene with all of their detail clearly visible.\u00a0 In order to create a photo with a high dynamic range, one needs to get creative.\u00a0 The following page explains how to create an HDR (High Dynamic Range) photo and overcome one of the camera’s limitation.<\/p>\n

HDR Methodology<\/h2>\n

\"Mount<\/p>\n

To create an image with a HDR (High Dynamic Range), you need to take several snapshots of the same scene without moving.\u00a0 The above image was created from three separate photos.\u00a0 The first photo was taken with normal exposure settings.\u00a0 The second and third photos were taken with exposure settings of -1.0ev and +1.0ev respectively.\u00a0 The second photo was underexposed by an exposure value of 1.0ev, which is roughly twice as dark as the normal shot.\u00a0 The\u00a0 third photo was overexposed by the same amount.\u00a0 These three pictures were combined in Photoshop to produce a high resolution 32-bit-per-component image using the HDR merge tool.\u00a0 Photoshop uses the overexposed image to fill in detail for the shadows.\u00a0 The underexposed image is used to fill in detail for the highlights.\u00a0 The generated image captures the dynamic range of exposure throughout the image, but has too much component resolution, and\u00a0 cannot be displayed on screens or printers correctly.\u00a0 To fix this, we have more work to do.<\/p>\n

HDR Final Steps<\/h2>\n

\"Mount \"Mount \"Mount<\/p>\n

The combined HDR image has 32 bits of resolution per component (red, green, blue).\u00a0 Images displayed on the screen and printers at this resolution are not rendered correctly.\u00a0 To fix this, we need to lower the 32 bit resolution image to a 16 or 8 bit resolution.\u00a0 Because we are loosing resolution, we need to make sure the new image represents as much of the high resolution range as possible.\u00a0 A tool in Photoshop called the “Local Adaptation” HDR conversion tool does this, and allows you to adjust a variety of parameters to control the process.\u00a0 The tool’s histogram can be used, for example, to capture the majority of the range being used.\u00a0 By adjusting the shape of the histogram curve, some tones can be given accentuated over others.\u00a0 The final result is a normal component resolution photo with a higher than normal dynamic range for the given scene and the camera’s capabilities.\u00a0 Because the images is created from more than one source image, objects that have moved in the scene between frames must be fixed with other tools (clone brush, spot removal, etc).\u00a0 Taking the photos with different exposures quickly will eliminate much of the work in this final step.<\/p>\n

\"Mount<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

HDR is High Dynamic Range DSLR cameras have come a long way.\u00a0 Dark and bright situations can be captured better than ever before.\u00a0 Because cameras have gotten smarter, you wouldn’t […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-777","page","type-page","status-publish","hentry"],"yoast_head":"\nHDR - Hillel Steinberg's Immersive Photography<\/title>\n<meta name=\"description\" content=\"Hillel's Steinberg's HDR Photography\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/analyze3d.com\/Site\/hdr\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HDR - Hillel Steinberg's Immersive Photography\" \/>\n<meta property=\"og:description\" content=\"Hillel's Steinberg's HDR Photography\" \/>\n<meta property=\"og:url\" content=\"https:\/\/analyze3d.com\/Site\/hdr\/\" \/>\n<meta property=\"og:site_name\" content=\"Hillel Steinberg's Immersive Photography\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hillelstein\" \/>\n<meta property=\"article:modified_time\" content=\"2014-11-15T17:16:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/analyze3d.com\/Media\/HDR\/HDR1.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@hytel\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/analyze3d.com\\\/Site\\\/hdr\\\/\",\"url\":\"https:\\\/\\\/analyze3d.com\\\/Site\\\/hdr\\\/\",\"name\":\"HDR - 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