{"id":2925,"date":"2022-05-06T14:36:22","date_gmt":"2022-05-06T13:36:22","guid":{"rendered":"https:\/\/nntt.auria.org\/?p=2925"},"modified":"2023-11-30T21:17:25","modified_gmt":"2023-11-30T20:17:25","slug":"experimentem-amb-la-tecnica-del-croma","status":"publish","type":"post","link":"https:\/\/nntt2.auria.org\/index.php\/2022\/05\/06\/experimentem-amb-la-tecnica-del-croma\/","title":{"rendered":"Experimentem amb la t\u00e8cnica del Croma"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">Aquesta setmana hem estat experimentant amb una t\u00e8cnica &#8220;cinematogr\u00e0fica&#8221; molt antiga per\u00f2 molt potent i visualment molt atractiva. Estem parlant del Croma. <\/p>\n\n\n\n<p class=\"has-medium-font-size\">Segons la Viquip\u00e8dia: El&nbsp;<strong>croma<\/strong>,&nbsp;<strong>clau de color<\/strong>&nbsp;o&nbsp;<strong>escenografia virtual<\/strong>&nbsp;(<em>chroma key<\/em>&nbsp;en&nbsp;<a href=\"https:\/\/ca.wikipedia.org\/wiki\/Llengua_anglesa\">angl\u00e8s<\/a>) \u00e9s una t\u00e8cnica de postproducci\u00f3 i efectes visuals que consisteix en la substituci\u00f3 d&#8217;una font del mateix color (normalment algun dels colors primaris, en especial verd i blau) per imatges o v\u00eddeos, aconseguint d&#8217;aquesta forma una composici\u00f3. Des del seu descobriment, la t\u00e8cnica va ser vista com un proc\u00e9s bastant econ\u00f2mic,<sup><a href=\"https:\/\/ca.wikipedia.org\/wiki\/Croma#cite_note-1\">[1]<\/a><\/sup>&nbsp;\u00e9s per aix\u00f2 que ha estat utilitzada a molts camps de l&#8217;audiovisual com la televisi\u00f3, la fotografia i la ind\u00fastria dels videojocs.&nbsp;Per fer-ho s&#8217;utilitzen programes d&#8217;edici\u00f3 o postproducci\u00f3 amb els que s&#8217;aconsegueix fer transparent tota una gamma de color pr\u00e8viament seleccionada que normalment se&nbsp;situa al fons de la gravaci\u00f3 o imatge, permetent aix\u00ed inserir una imatge est\u00e0tica o v\u00eddeo a l&#8217;escena.&nbsp;<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Nosaltres hem utilitzat una tela verda, un suport per la tela, un ordinador port\u00e0til, una tele i una web cam. I amb aquests 5 elements hem disfrutat molt experimentant amb diferents efectes visuals com per exemple canviar el fons d&#8217;on ens trobavem, incorporar elements que no hi havia com animals, explossions de fum, etc.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.39.22-768x1024.jpeg\" alt=\"\" class=\"wp-image-2928\" srcset=\"https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.39.22-768x1024.jpeg 768w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.39.22-600x800.jpeg 600w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.39.22-225x300.jpeg 225w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.39.22-1152x1536.jpeg 1152w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.39.22.jpeg 1500w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.40.56-768x1024.jpeg\" alt=\"\" class=\"wp-image-2929\" srcset=\"https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.40.56-768x1024.jpeg 768w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.40.56-600x800.jpeg 600w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.40.56-225x300.jpeg 225w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.40.56-1152x1536.jpeg 1152w, https:\/\/nntt2.auria.org\/wp-content\/uploads\/2022\/05\/WhatsApp-Image-2022-05-06-at-15.40.56.jpeg 1500w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size\">Per tal de mostrar-vos del que estem parlant us hem preparat un petit video amb un tastet del que vam fer durant les sessions.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">esperem que el disfruteu:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"VideoChroma\" width=\"604\" height=\"340\" src=\"https:\/\/www.youtube.com\/embed\/CnehpU8RoaE?start=1&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Recordeu que per qualsevol dubte, suggeriment o idees que  volgueu compartir amb nosaltres o podeu fer a trav\u00e9s del nostre correu: nntt@auriagrup.cat<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aquesta setmana hem estat experimentant amb una t\u00e8cnica &#8220;cinematogr\u00e0fica&#8221; molt antiga per\u00f2 molt potent i visualment molt atractiva. Estem parlant del Croma. Segons la Viquip\u00e8dia: El&nbsp;croma,&nbsp;clau de color&nbsp;o&nbsp;escenografia virtual&nbsp;(chroma key&nbsp;en&nbsp;angl\u00e8s) \u00e9s una<a class=\"moretag\" href=\"https:\/\/nntt2.auria.org\/index.php\/2022\/05\/06\/experimentem-amb-la-tecnica-del-croma\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93,191],"tags":[90,104,105,106,107],"class_list":["post-2925","post","type-post","status-publish","format-standard","hentry","category-activitats","category-idees-activitats","tag-activitat","tag-croma","tag-tecnica-cinematografica","tag-tela","tag-verda"],"_links":{"self":[{"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/posts\/2925","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/comments?post=2925"}],"version-history":[{"count":3,"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/posts\/2925\/revisions"}],"predecessor-version":[{"id":3711,"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/posts\/2925\/revisions\/3711"}],"wp:attachment":[{"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/media?parent=2925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/categories?post=2925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nntt2.auria.org\/index.php\/wp-json\/wp\/v2\/tags?post=2925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}