{"id":48277,"date":"2019-12-09T14:06:43","date_gmt":"2019-12-09T12:06:43","guid":{"rendered":"https:\/\/blog.cofb.cat\/?p=48277"},"modified":"2019-12-09T14:06:43","modified_gmt":"2019-12-09T12:06:43","slug":"cinc-centims-de-fotografia-a-la-neu","status":"publish","type":"post","link":"https:\/\/www.cofb.org\/es\/2019\/12\/09\/cinc-centims-de-fotografia-a-la-neu\/","title":{"rendered":"Cinco c\u00e9ntimos de\u2026 Fotograf\u00eda en la nieve"},"content":{"rendered":"<h3><\/h3>\n<h3><strong><em>Art\u00edculo de Marta Pons, miembro de la Secci\u00f3n de Fotograf\u00eda del Colegio de Farmac\u00e9uticos de Barcelona (FotoCofb)<\/em><\/strong><\/h3>\n<p><strong>Cuando fotografiamos nieve o una pared blanca que sea uniforme<\/strong>, es decir, sin ning\u00fan detalle que destaque, <strong>se produce un hecho curioso<\/strong>.\u00a0<strong>La c\u00e1mara reacciona como el ojo humano<\/strong>: delante del blanco uniforme y luminoso de la nieve, <strong>intenta captar menos luz<\/strong> (cerrando la apertura del diafragma) <strong>y nunca se consigue una foto blanca por completo<\/strong>. De esta forma, la nieve uniforme coge una <strong>tonalidad gris\u00e1cea<\/strong>. Si queremos que se vea blanca <strong>deberemos sobreexponer ligeramente<\/strong>, vigilando de no excedernos.<\/p>\n<p><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Petjada.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-48287\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Petjada.jpg\" alt=\"\" width=\"961\" height=\"669\" \/><\/a><\/p>\n<p><span style=\"color: #000000;\">Me di cuenta una vez, intentando fotografiar una huella de alg\u00fan animalito sobre la nieve virgen. No hab\u00eda forma de conseguir la delicada sombra sobre la nieve blanca. Un gran profesional que conozco me lo cont\u00f3 y mis \u201cfotos extra\u00f1as\u201d han mejorado un poco. Por miedo a quemar la nieve <strong>no sobreexpuse<\/strong> y <strong>la nieve qued\u00f3 gris\u00e1cea<\/strong><\/span>.<\/p>\n<p>En cambio, <strong>si aparecen otros colores en la fotograf\u00eda<\/strong>, como en la foto siguiente, <strong>el resto de objetos del paisaje equilibran la exposici\u00f3n y la nieve<\/strong>. Esto ocurre porque el modo autom\u00e1tico o semiautom\u00e1tico utiliza una <strong>apertura intermedia<\/strong>.<\/p>\n<p><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Paseig-amb-arbres.jpg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-48286\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Paseig-amb-arbres.jpg\" alt=\"\" width=\"968\" height=\"706\" \/><\/a><\/p>\n<p><strong>Vemos un caso pr\u00e1ctico:<\/strong><\/p>\n<p>Esta fotograf\u00eda ha sido tomada en <strong>modo semiautom\u00e1tico fijando la velocidad<\/strong>. <strong>Toda ella se ve oscura, es decir, subexpuesta<\/strong>.<\/p>\n<figure id=\"attachment_48283\" aria-describedby=\"caption-attachment-48283\" style=\"width: 876px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Esqu\u00ed-1.jpg\"><img decoding=\"async\" class=\"wp-image-48283 size-full\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Esqu\u00ed-1.jpg\" alt=\"Fotografia subexposada.\" width=\"876\" height=\"584\" \/><\/a><figcaption id=\"caption-attachment-48283\" class=\"wp-caption-text\">Par\u00e1metros de la fotograf\u00eda: ISO:200 \u2013 v:1\/2000 \u2013 f:11<\/figcaption><\/figure>\n<p>En este caso, hemos tomado la misma fotograf\u00eda y <strong>la hemos editado posteriormente, aumentando la exposici\u00f3n<\/strong>. La luminosidad ha aumentado, pero <strong>hemos obtenido una caracter\u00edstica indeseada: la nieve tiene un tono azulado.<\/strong><\/p>\n<figure id=\"attachment_48284\" aria-describedby=\"caption-attachment-48284\" style=\"width: 876px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Esqu\u00ed-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-48284 size-full\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Esqu\u00ed-2.jpg\" alt=\"Fotografia anterior, per\u00f2 editada incrementant l'exposici\u00f3.\" width=\"876\" height=\"584\" \/><\/a><figcaption id=\"caption-attachment-48284\" class=\"wp-caption-text\">Fotograf\u00eda anterior pero editada incrementando la exposici\u00f3n.<\/figcaption><\/figure>\n<p><span style=\"color: #000000;\"><strong>La pr\u00f3xima vez sobreexpondr\u00e9<\/strong> <strong>abriendo al menos 1 punto el diafragma<\/strong> (f), o sea en la fotograf\u00eda el diafragma deber\u00eda haber sido 8. <strong>Es mejor realizar m\u00e1s de una prueba<\/strong>, ya que cabe la posibilidad de que la apertura necesaria sea 2 puntos m\u00e1s alta. <strong>Para eliminar el azul, es recomendable utilizar posteriormente un programa de edici\u00f3n.<\/strong><\/span><\/p>\n<figure id=\"attachment_48285\" aria-describedby=\"caption-attachment-48285\" style=\"width: 876px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Esqu\u00ed-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-48285 size-full\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/11\/Esqu\u00ed-3.jpg\" alt=\"Mateixa imatge tornada a editar. En aquesta ocasi\u00f3 hem redu\u00eft el blau.\" width=\"876\" height=\"584\" \/><\/a><figcaption id=\"caption-attachment-48285\" class=\"wp-caption-text\">Misma imagen editada de nuevo. En esta ocasi\u00f3n hemos reducido el azul.<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<div class=\"box info\"><\/p>\n<p>Peri\u00f3dicamente, desde la <strong>Secci\u00f3n de Fotograf\u00eda del Colegio de Farmac\u00e9uticos de Barcelona<\/strong> (FotoCofb), iremos compartiendo bajo el formato llamado <strong>\u201cCinco c\u00e9ntimos de \u2026\u201d<\/strong> que pretende ser una <strong>r\u00e1pida aproximaci\u00f3n que aporte conceptos b\u00e1sicos en diferentes<\/strong> <strong>aspectos fotogr\u00e1ficos<\/strong> y as\u00ed conseguir mejorar nuestra dedicaci\u00f3n fotogr\u00e1fica. Para cualquier duda o consulta estamos a su disposici\u00f3n. Puede contactarnos por correo: fotocofb@gmail.com oa trav\u00e9s de Maribel Cortes (mcortes@cofb.net).<\/p>\n<p><\/div>\n<p><strong>Otras publicaciones de \u201cCinco c\u00e9ntimos de\u2026\u201d:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/blog.cofb.cat\/cinc-centims-de-lhistograma-un-bon-ajut-per-millorar-les-nostres-fotos\/\" target=\"_blank\" rel=\"noopener\">Cinco c\u00e9ntimos de\u2026 El histograma, una buena ayuda para mejorar nuestras fotos (Marzo 2019)<\/a><\/li>\n<li><a href=\"https:\/\/blog.cofb.cat\/cinc-centims-aconseguir-millores-nostres-fotografies\/\" target=\"_blank\" rel=\"noopener\">Cinco c\u00e9ntimos de\u2026 C\u00f3mo elegir una c\u00e1mara (Enero 2019)<\/a><\/li>\n<li><a href=\"https:\/\/blog.cofb.cat\/cinc-centims-triar-camera\/\" target=\"_blank\" rel=\"noopener\">Cinco c\u00e9ntimos de\u2026\u00bfC\u00f3mo conseguir mejoras en nuestras fotograf\u00edas? (Noviembre 2018)<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Art\u00edculo de Marta Pons, miembro de la Secci\u00f3n de Fotograf\u00eda del Colegio de Farmac\u00e9uticos de Barcelona (FotoCofb) Cuando fotografiamos nieve o una pared blanca que sea uniforme, es decir, sin ning\u00fan detalle que destaque, se produce algo curioso. La c\u00e1mara reacciona como el ojo humano: frente al blanco uniforme y [\u2026]<\/p>","protected":false},"author":1,"featured_media":48285,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[535],"tags":[3665,3158,3757,3286,3758,536,955,3759,3760],"class_list":["post-48277","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seccio-de-fotografia-del-cofb","tag-aficio-a-la-fotografia","tag-fotocofb","tag-fotografia-de-neu","tag-iniciacio-a-la-fotografia","tag-neu","tag-seccio-de-fotografia-del-collegi-de-farmaceutics-de-barcelona","tag-seccio-fotografia","tag-sobreexposicio","tag-subexposicio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cinc c\u00e8ntims de... 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