{"id":5523,"date":"2025-05-30T17:28:01","date_gmt":"2025-05-30T15:28:01","guid":{"rendered":"https:\/\/camaraenmano.org\/?p=5523"},"modified":"2025-05-30T18:20:44","modified_gmt":"2025-05-30T16:20:44","slug":"ettr-derechear-el-histograma-o-exponer-hacia-la-derecha","status":"publish","type":"post","link":"https:\/\/camaraenmano.org\/index.php\/2025\/05\/30\/ettr-derechear-el-histograma-o-exponer-hacia-la-derecha\/","title":{"rendered":"ETTR \u2013 derechear el histograma o exponer hacia la derecha"},"content":{"rendered":"<p><strong>\u00bfQu\u00e9 significa \u201cETTR\u201d?<\/strong><\/p>\n<p style=\"text-align: justify;\">\u201cExposure to the Right\u201d (exponer a la derecha, llamada a veces en espa\u00f1ol como \u201c<em>derechear<\/em>\u201d) es una t\u00e9cnica avanzada de exposici\u00f3n que consiste en ajustar la exposici\u00f3n de manera que el histograma de la imagen quede lo m\u00e1s hacia la derecha posible, pero cuidando de no llegar a quemar las altas luces. Con esta acci\u00f3n ayudamos al sensor a capturar la mayor cantidad posible de informaci\u00f3n luminosa, lo que es muy \u00fatil en escenas con rangos din\u00e1micos extremos, donde la diferencia de luminosidad entre las altas luces y las sombras m\u00e1s oscuras es muy notable.<\/p>\n<p style=\"text-align: justify;\">Maximizar la calidad de imagen<\/p>\n<p style=\"text-align: justify;\">En fotograf\u00eda digital, los sensores capturan m\u00e1s informaci\u00f3n en las zonas claras que en las sombras. Esto se debe a que el ruido es m\u00e1s evidente cuando la se\u00f1al es m\u00e1s d\u00e9bil, cuando hay poca luz, como sucede en las zonas oscuras.<\/p>\n<p style=\"text-align: justify;\"><em>Imagina esto:<\/em><\/p>\n<ul style=\"text-align: justify;\">\n<li>El sensor necesita registrar 1000 unidades de se\u00f1al m\u00e1xima para estar bien expuesto.<\/li>\n<li>El ruido base inherente a la electr\u00f3nica es siempre 1 unidad.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><em>Si captamos una zona media con 100 unidades:<\/em><\/p>\n<ul style=\"text-align: justify;\">\n<li>La c\u00e1mara amplifica x10 \u2192 se\u00f1al: 1000 \/ ruido: 10 \u2192 relaci\u00f3n 1%<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><em>Pero si captamos una sombra con solo 10 unidades:<\/em><\/p>\n<ul style=\"text-align: justify;\">\n<li>La c\u00e1mara tiene que intensificar la amplificaci\u00f3n a x100 \u2192 se\u00f1al: 1000 \/ ruido: 100 \u2192 relaci\u00f3n 10%<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Esta es la raz\u00f3n por la que el ruido se hace m\u00e1s visible al levantar sombras en la edici\u00f3n, porque la relaci\u00f3n se\u00f1al\/ruido empeora en estas zonas de poca luz (se\u00f1al). El ruido ya estaba ah\u00ed pero no lo ve\u00edamos.<\/p>\n<p style=\"text-align: justify;\">Aplicaci\u00f3n pr\u00e1ctica de ETTR<\/p>\n<p style=\"text-align: justify;\">Vamos a sacar dos fotos del mismo motivo, una muy sobreexpuesta (si, ya s\u00e9, no hab\u00eda que quemar), y otra subexpuesta.<\/p>\n<p style=\"text-align: justify;\">Sacaremos las dos fotos en RAW para que no perdamos ninguna informaci\u00f3n (el JPG no es adecuado porque descarta los datos que no usa, con lo que se pierde mucho detalle en los extremos del rango din\u00e1mico).<\/p>\n<p style=\"text-align: justify;\">Hacemos la primera foto subexpuesta: ISO 100, v 1\/20, f 11, distancia focal 105 mm<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5524 aligncenter\" src=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/WhatsApp-Image-2025-05-30-at-17.16.41.jpeg\" alt=\"\" width=\"499\" height=\"317\" srcset=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/WhatsApp-Image-2025-05-30-at-17.16.41.jpeg 900w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/WhatsApp-Image-2025-05-30-at-17.16.41-300x191.jpeg 300w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/WhatsApp-Image-2025-05-30-at-17.16.41-768x488.jpeg 768w\" sizes=\"auto, (max-width: 499px) 100vw, 499px\" \/><\/p>\n<p style=\"text-align: justify;\">Ahora la segunda, sobreexpuesta: ISO 100, v 0\u201d3, f 11, distancia focal 105 mm<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5525 aligncenter\" src=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image.jpg\" alt=\"\" width=\"499\" height=\"317\" srcset=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image.jpg 900w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-300x191.jpg 300w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-768x488.jpg 768w\" sizes=\"auto, (max-width: 499px) 100vw, 499px\" \/><\/p>\n<p style=\"text-align: justify;\">Ahora editamos ambas fotograf\u00edas para dejarlas con una exposici\u00f3n correcta y subimos las sombras y negros al m\u00e1ximo posible para sacar detalle.<\/p>\n<p style=\"text-align: justify;\">ISO100, Obturaci\u00f3n 0\u201d3, f 11, focal 105 mm NEGRO Y SOMBRAS al m\u00e1ximo<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5526 aligncenter\" src=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-1.jpg\" alt=\"\" width=\"500\" height=\"318\" srcset=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-1.jpg 900w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-1-300x191.jpg 300w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-1-768x488.jpg 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p style=\"text-align: justify;\">ISO100, Obturaci\u00f3n 0\u201d3, f 11, focal 105 mm NEGRO Y SOMBRAS al m\u00e1ximo<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5531 aligncenter\" src=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-4.jpg\" alt=\"\" width=\"501\" height=\"318\" srcset=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-4.jpg 900w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-4-300x191.jpg 300w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-4-768x488.jpg 768w\" sizes=\"auto, (max-width: 501px) 100vw, 501px\" \/><\/p>\n<p style=\"text-align: justify;\">Aparentemente son pr\u00e1cticamente iguales muy similares, incluyendo el histograma, pero\u2026 \u00bfqu\u00e9 pasa si hacemos zoom en las sombras?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5528 aligncenter\" src=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-3.jpg\" alt=\"\" width=\"611\" height=\"305\" srcset=\"https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-3.jpg 893w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-3-300x150.jpg 300w, https:\/\/camaraenmano.org\/wp-content\/uploads\/2025\/05\/image-3-768x384.jpg 768w\" sizes=\"auto, (max-width: 611px) 100vw, 611px\" \/><\/p>\n<p style=\"text-align: justify;\">Podemos ver que hay m\u00e1s ruido en la foto subexpuesta que en la sobreexpuesta. Como hemos comentado, este efecto se notar\u00e1 sobre todo en situaciones de duz dura, con grandes contrastes entre luces y sombras, por ejemplo en mediod\u00edas.<\/p>\n<p style=\"text-align: justify;\">Esta t\u00e9cnica es recomendable cuando:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Estamos en un entorno de luces duras sombras muy oscuras (rango din\u00e1mico extremo).<\/li>\n<li>Tenemos tiempo para ajustar la c\u00e1mara y hacer varias pruebas para comprobar que disparamos a la derecha sin quemar.<\/li>\n<li>Siempre hay que sacar la foto en RAW.<\/li>\n<li>Los ajustes m\u00e1s habituales son diafragma en torno a f11, velocidad que evite trepidaci\u00f3n e ISO entre 100 y 400. &#8211; Al editar no olvidar corregir la exposici\u00f3n -.<\/li>\n<li>Es una buena t\u00e9cnica para luces duras en paisajes, fotograf\u00eda callejera, fotograf\u00eda de producto en estudio, arquitectura con luz controlada que nos permite obtener mas detalles en las sombras<\/li>\n<li>No es aconsejable en disparo con formatos comprimidos como JPG (sin rango de recuperaci\u00f3n), fotograf\u00edas r\u00e1pidas o espont\u00e1neas, y en situaciones de poca luminosidad (ISOs altos, donde el margen de mejora va a ser menor)<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Juan Luis Rodr\u00edguez<\/p>\n<p style=\"text-align: justify;\">C\u00e1mara en Mano \u2013 30 mayo de 2025<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00bfQu\u00e9 significa \u201cETTR\u201d? \u201cExposure to the Right\u201d (exponer a la derecha, llamada a veces en espa\u00f1ol como \u201cderechear\u201d) es una t\u00e9cnica avanzada de exposici\u00f3n que consiste en ajustar la exposici\u00f3n de manera que el histograma de la imagen quede lo m\u00e1s hacia la derecha posible, pero cuidando de no llegar a quemar las altas luces. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5526,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":{"0":"post-5523","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-tecnica-fotografica","8":"czr-hentry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ETTR \u2013 derechear el histograma o exponer hacia la derecha - Asociaci\u00f3n fotogr\u00e1fica C\u00e1mara en mano Las Rozas<\/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:\/\/camaraenmano.org\/index.php\/2025\/05\/30\/ettr-derechear-el-histograma-o-exponer-hacia-la-derecha\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ETTR \u2013 derechear el histograma o exponer hacia la derecha - Asociaci\u00f3n fotogr\u00e1fica C\u00e1mara en mano Las Rozas\" \/>\n<meta property=\"og:description\" content=\"\u00bfQu\u00e9 significa \u201cETTR\u201d? \u201cExposure to the Right\u201d (exponer a la derecha, llamada a veces en espa\u00f1ol como \u201cderechear\u201d) es una t\u00e9cnica avanzada de exposici\u00f3n que consiste en ajustar la exposici\u00f3n de manera que el histograma de la imagen quede lo m\u00e1s hacia la derecha posible, pero cuidando de no llegar a quemar las altas luces. 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