{"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\/ca\/2019\/03\/12\/cinc-centims-de-lhistograma-un-bon-ajut-per-millorar-les-nostres-fotos\/","title":{"rendered":"Cinc c\u00e8ntims de&#8230; L&#8217;histograma, un bon ajut per millorar les nostres fotos"},"content":{"rendered":"<p>L&#8217;<strong>histograma<\/strong> \u00e9s una eina que hi ha a les nostres c\u00e0meres que ens diu si l&#8217;exposici\u00f3 \u00e9s correcta o no en el mateix moment que fem la fotografia. Ens <strong>informa<\/strong> sobre la <strong>protecci\u00f3<\/strong> <strong>de p\u00edxels<\/strong> <strong>de cada tonalitat<\/strong> que hi ha en una imatge. Per aix\u00f2, \u00e9s una eina molt interessant que val la pena aprofitar.<\/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\u00e0fica combina dues variables. L\u2019<strong>eix vertical<\/strong> indica quina proporci\u00f3 de cada tonalitat hi ha a la imatge. L\u2019<strong>eix horitzontal<\/strong> distribueix les diferents tonalitats de gris, la part esquerra correspon al negre pur i la dreta al blanc pur.<\/p>\n<h1><span style=\"color: #008080;\"><strong>Com llegir un histograma\u00a0<\/strong><\/span><\/h1>\n<p>Si ens fixem en l&#8217;eix horitzontal i el dividim mentalment en tres zones, la de l&#8217;esquerra ens diu la quantitat d&#8217;ombres i de parts fosques de la imatge, la central ens informa de la lluminositat mitjana i la dreta de la quantitat de blancs i llums de la imatge.<\/p>\n<p>En general podrem dir:<\/p>\n<ul>\n<li>Un histograma que acumuli la major part de la informaci\u00f3 en la part dreta, \u00e9s molt probable que correspongui a una<strong> imatge sobreexposada. <\/strong><\/li>\n<li>A l\u2019inrev\u00e9s, si la major part de la informaci\u00f3 la trobem a la part esquerra, \u00e9s molt probable que estigui <strong>subexposada<\/strong>.<\/li>\n<li>Un histograma amb tota la informaci\u00f3 acumulada en una mateixa zona, ens donar\u00e0 una <strong>imatge poc contrastada<\/strong>, ja que el contrast lum\u00ednic el proporciona la difer\u00e8ncia entre llum i ombra.<\/li>\n<li>Si la informaci\u00f3 la trobem acumulada als dos extrems de la gr\u00e0fica, ser\u00e0 una <strong>imatge<\/strong> <strong>d&#8217;alt contrast<\/strong> com, per exemple, un contrallum.<\/li>\n<\/ul>\n<p>Cal no oblidar que les caracter\u00edstiques de la fotografia les decideix la persona que fa la foto, per tant <strong>no cal obsessionar-se per saber si l&#8217;histograma est\u00e0 equilibrat o no<\/strong>, simplement cal <strong>fer-ne una bona interpretaci\u00f3 per aconseguir el millor resultat.<\/strong><\/p>\n<p>Et recomanem que configuris la c\u00e0mera perqu\u00e8 et mostri l\u2019histograma i analitzis la foto. Pensa que <strong>com m\u00e9s coneguis la teva c\u00e0mera, m\u00e9s partit en pots treure.<\/strong><\/p>\n<h1><span style=\"color: #008080;\"><strong>Claus tonals: clau alta i clau baixa<\/strong><\/span><\/h1>\n<p>El coneixement de l&#8217;histograma ens pot ajudar a desenvolupar una <strong>bona t\u00e8cnica<\/strong> per comen\u00e7ar a fer <strong>fotos amb nivells extremadament alts de blancs o de negres.<\/strong><\/p>\n<p>A continuaci\u00f3 presentem una s\u00e8rie de fotografies amb el seu histograma perqu\u00e8 puguis analitzar la informaci\u00f3 que d\u00f3na.<\/p>\n<p>A la<strong> fotografia en clau alta<\/strong>, apareixen tots els <strong>tons<\/strong> de la gamma per\u00f2 predominen els <strong>clars<\/strong>. En general s\u00f3n escenes amb poc contrast. Molta llum. Tons suaus. Poques ombres. La <strong>il\u00b7luminaci\u00f3<\/strong> \u00e9s <strong>molt<\/strong> <strong>homog\u00e8nia<\/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>A la <strong>fotografia en clau baixa<\/strong> apareixen tots els tons, per\u00f2 predominen els foscos. Un sol punt de llum. Fons negre. Escena contrastada. Prioritza els tons foscos en la composici\u00f3.<\/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>Tant la clau alta com la baixa <strong>s\u00f3n imatges amb una llum molt controlada<\/strong>. No s\u00f3n fotos ni sobreexposades, ni subexposades.<\/p>\n<h2><span style=\"color: #008080;\"><strong>Foto subexposada<\/strong><\/span><\/h2>\n<p>L\u2019histograma mostra una zona a l\u2019esquerra que correspon a la part fosca inferior subexposada, i una zona mitjana que correspon al cel.<\/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 exposada correctament<\/span><\/strong><\/h2>\n<p>L\u2019histograma mostra una manca de negres i blanc absoluts.<\/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 \u00e9s una foto d\u2019alt contrast. Per ser una foto d\u2019alt contrast hauria de tenir una zona de blancs similar a la de negres. \u00c9s una foto en la qual <strong>domina el color negre.<\/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\u00f2dicament, des de la <strong>Secci\u00f3 de Fotografia del Col\u00b7legi de Farmac\u00e8utics de Barcelona (FotoCofb)<\/strong>, anirem compartint sota el format anomenat <strong>\u201cCinc c\u00e8ntims de \u2026\u201d<\/strong> que pret\u00e9n ser una <strong>r\u00e0pida aproximaci\u00f3 que aporti conceptes b\u00e0sics en diferents aspectes fotogr\u00e0fics<\/strong> i aix\u00ed aconseguir millorar la nostra dedicaci\u00f3 fotogr\u00e0fica. Per a qualsevol dubte o consulta estem a la vostra disposici\u00f3. Podeu contactar-nos per correu: fotocofb@gmail.com o a trav\u00e9s de Maribel Cortes (mcortes@cofb.net). <\/div>\n","protected":false},"excerpt":{"rendered":"<p>L&#8217;histograma \u00e9s una eina que hi ha a les nostres c\u00e0meres que ens diu si l&#8217;exposici\u00f3 \u00e9s correcta o no en el mateix moment que fem la fotografia. Ens informa sobre la protecci\u00f3 de p\u00edxels de cada tonalitat que hi ha en una imatge. Per aix\u00f2, \u00e9s una eina molt [&hellip;]<\/p>\n","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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