{"id":44849,"date":"2019-03-12T15:40:12","date_gmt":"2019-03-12T13:40:12","guid":{"rendered":"https:\/\/blog.cofb.cat\/?p=44849"},"modified":"2019-03-12T15:40:12","modified_gmt":"2019-03-12T13:40:12","slug":"cinc-centims-de-lhistograma-un-bon-ajut-per-millorar-les-nostres-fotos","status":"publish","type":"post","link":"https:\/\/www.cofb.org\/es\/2019\/03\/12\/cinc-centims-de-lhistograma-un-bon-ajut-per-millorar-les-nostres-fotos\/","title":{"rendered":"Cinco c\u00e9ntimos de\u2026 El histograma, una buena ayuda para mejorar nuestras fotos"},"content":{"rendered":"<p>La<strong>histograma<\/strong> es una herramienta que existe en nuestras c\u00e1maras que nos dice si la exposici\u00f3n es correcta o no en el mismo momento que hacemos la fotograf\u00eda. Nos <strong>informa<\/strong> sobre la <strong>protecci\u00f3n<\/strong> <strong>de p\u00edxeles<\/strong> <strong>de cada tonalidad<\/strong> que hay en una imagen. Por eso, es una herramienta muy interesante que vale la pena aprovechar.<\/p>\n<p><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/5-CENTIMS.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-44850\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/5-CENTIMS.jpg\" alt=\"\" width=\"600\" height=\"250\" \/><\/a><\/p>\n<p>La gr\u00e1fica combina dos variables. El<strong>eje vertical<\/strong> indica qu\u00e9 proporci\u00f3n de cada tonalidad existe en la imagen. El<strong>eje horizontal<\/strong> distribuye las diferentes tonalidades de gris, la parte izquierda corresponde al negro puro y la derecha al blanco puro.<\/p>\n<h1><span style=\"color: #008080;\"><strong>C\u00f3mo leer un histograma\u00a0<\/strong><\/span><\/h1>\n<p>Si nos fijamos en el eje horizontal y lo dividimos mentalmente en tres zonas, la de la izquierda nos dice la cantidad de sombras y partes oscuras de la imagen, la central nos informa de la luminosidad media y la derecha de la cantidad de blancos y luces de la imagen.<\/p>\n<p>Por lo general podremos decir:<\/p>\n<ul>\n<li>Un histograma que acumule la mayor parte de la informaci\u00f3n en la parte derecha, es muy probable que corresponda a una<strong> imagen sobreexpuesta. <\/strong><\/li>\n<li>Al rev\u00e9s, si la mayor parte de la informaci\u00f3n la encontramos en la parte izquierda, es muy probable que est\u00e9 <strong>subexpuesta<\/strong>.<\/li>\n<li>Un histograma con toda la informaci\u00f3n acumulada en una misma zona, nos dar\u00e1 una <strong>imagen poco contrastada<\/strong>, puesto que el contraste lum\u00ednico lo proporciona la diferencia entre luz y sombra.<\/li>\n<li>Si la informaci\u00f3n la encontramos acumulada en los dos extremos de la gr\u00e1fica, ser\u00e1 una <strong>imagen<\/strong> <strong>de alto contraste<\/strong> como, por ejemplo, un contraluz.<\/li>\n<\/ul>\n<p>No hay que olvidar que las caracter\u00edsticas de la fotograf\u00eda las decide la persona que toma la foto, por tanto <strong>no es necesario obsesionarse por saber si el histograma est\u00e1 equilibrado o no<\/strong>, simplemente es necesario <strong>hacer una buena interpretaci\u00f3n para conseguir el mejor resultado.<\/strong><\/p>\n<p>Te recomendamos que configures la c\u00e1mara para que te muestre el histograma y analices la foto. Piensa que <strong>cuanto m\u00e1s conozcas tu c\u00e1mara, m\u00e1s partido puedes sacarlo.<\/strong><\/p>\n<h1><span style=\"color: #008080;\"><strong>Claves tonales: clave alta y clave baja<\/strong><\/span><\/h1>\n<p>El conocimiento del histograma nos puede ayudar a desarrollar una <strong>buena t\u00e9cnica<\/strong> para empezar a hacer <strong>fotos con niveles extremadamente altos de blancos o negros.<\/strong><\/p>\n<p>A continuaci\u00f3n presentamos una serie de fotograf\u00edas con su histograma para que puedas analizar la informaci\u00f3n que proporciona.<\/p>\n<p>En la<strong> fotograf\u00eda en clave alta<\/strong>, aparecen todos los <strong>tonos<\/strong> de la gama pero predominan los <strong>claros<\/strong>. Por lo general son escenas con poco contraste. Mucha luz. Tonos suaves. Pocas sombras. La <strong>iluminaci\u00f3n<\/strong> es <strong>mucho<\/strong> <strong>homog\u00e9nea<\/strong>.<\/p>\n<figure id=\"attachment_44852\" aria-describedby=\"caption-attachment-44852\" style=\"width: 307px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/1.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"wp-image-44852\" title=\"Autor: Alfred Roig\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/1.jpg\" alt=\"Autor: Alfred Roig\" width=\"307\" height=\"453\" \/><\/a><figcaption id=\"caption-attachment-44852\" class=\"wp-caption-text\">Autor: Alfred Roig<\/figcaption><\/figure>\n<p><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/11.jpg\"><img decoding=\"async\" class=\"aligncenter wp-image-44864\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/11.jpg\" alt=\"\" width=\"600\" height=\"291\" \/><\/a><\/p>\n<p>En la <strong>fotograf\u00eda en clave baja<\/strong> aparecen todos los tonos, pero predominan los oscuros. Un solo punto de luz. Fondo negro. Escena contrastada. Prioriza los tonos oscuros en su composici\u00f3n.<\/p>\n<figure id=\"attachment_44854\" aria-describedby=\"caption-attachment-44854\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/3.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-44854\" title=\"Autor: Alfred Roig\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/3.jpg\" alt=\"Autor: Alfred Roig\" width=\"600\" height=\"600\" \/><\/a><figcaption id=\"caption-attachment-44854\" class=\"wp-caption-text\">Autor: Alfred Roig<\/figcaption><\/figure>\n<p>Tanto la clave alta como la baja <strong>son im\u00e1genes con una luz muy controlada<\/strong>. No son fotos ni sobreexpuestas, ni subexpuestas.<\/p>\n<h2><span style=\"color: #008080;\"><strong>Foto subexpuesta<\/strong><\/span><\/h2>\n<p>El histograma muestra una zona a la izquierda que corresponde a la parte oscura inferior subexpuesta, y una zona media que corresponde al cielo.<\/p>\n<figure id=\"attachment_44856\" aria-describedby=\"caption-attachment-44856\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/4.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-44856\" title=\"Autor: Alfred Roig\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/4.jpg\" alt=\"Autor: Alfred Roig\" width=\"600\" height=\"450\" \/><\/a><figcaption id=\"caption-attachment-44856\" class=\"wp-caption-text\">Autor: Alfred Roig<\/figcaption><\/figure>\n<h2><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/subexposada.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44884\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/subexposada.jpg\" alt=\"\" width=\"600\" height=\"291\" \/><\/a><\/h2>\n<h2><strong><span style=\"color: #008080;\">Foto expuesta correctamente<\/span><\/strong><\/h2>\n<p>El histograma muestra una carencia de negros y blanco absolutos.<\/p>\n<figure id=\"attachment_44857\" aria-describedby=\"caption-attachment-44857\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/5.png\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-44857\" title=\"Autor: Alfred Roig\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/5.png\" alt=\"Autor: Alfred Roig\" width=\"600\" height=\"433\" \/><\/a><figcaption id=\"caption-attachment-44857\" class=\"wp-caption-text\">Autor: Alfred Roig<\/figcaption><\/figure>\n<p><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/exposada-correctament.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44883\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/exposada-correctament.jpg\" alt=\"\" width=\"600\" height=\"292\" \/><\/a><\/p>\n<p>No es una foto de alto contraste. Por ser una foto de alto contraste deber\u00eda tener una zona de blancos similar a la de negros. Es una foto en la que <strong>domina el color negro.<\/strong><\/p>\n<figure id=\"attachment_44858\" aria-describedby=\"caption-attachment-44858\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/6.png\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-44858\" title=\"Autor: Alfred Roig\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/6.png\" alt=\"Autor: Alfred Roig\" width=\"600\" height=\"402\" \/><\/a><figcaption id=\"caption-attachment-44858\" class=\"wp-caption-text\">Autor: Alfred Roig<\/figcaption><\/figure>\n<p><a href=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/ultima-foto.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-44885\" src=\"https:\/\/blog.cofb.cat\/wp-content\/uploads\/2019\/03\/ultima-foto.jpg\" alt=\"\" width=\"600\" height=\"292\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<div class=\"box info\"> Peri\u00f3dicamente, desde la <strong>Secci\u00f3n de Fotograf\u00eda del Colegio de Farmac\u00e9uticos de Barcelona (FotoCofb)<\/strong>, 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 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). <\/div>","protected":false},"excerpt":{"rendered":"<p>El histograma es una herramienta que existe en nuestras c\u00e1maras que nos dice si la exposici\u00f3n es correcta o no en el mismo momento que hacemos la fotograf\u00eda. Nos informa sobre la protecci\u00f3n de p\u00edxeles de cada tonalidad que existe en una imagen. Por eso, es una herramienta muy [\u2026]<\/p>","protected":false},"author":1,"featured_media":44850,"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":[18,19,2154,3158,536],"class_list":["post-44849","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seccio-de-fotografia-del-cofb","tag-cofb","tag-collegi-de-farmaceutics-de-barcelona","tag-comissio-de-cultura","tag-fotocofb","tag-seccio-de-fotografia-del-collegi-de-farmaceutics-de-barcelona"],"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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