{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"bbcce9bd-b637-4fa6-8a80-dadabab80104","title":"数字化生存 20周年纪念版","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121307362","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"bbcce9bd-b637-4fa6-8a80-dadabab80104","id":"bbcce9bd-b637-4fa6-8a80-dadabab80104","uuid":"bbcce9bd-b637-4fa6-8a80-dadabab80104","title":"数字化生存 20周年纪念版","normalized_title":"数字化生存20周年纪念版","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121307362","isbns":["9787121307362"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":362,"navigation_url":"https://workshop.closeclaw.top/ai/book/bbcce9bd-b637-4fa6-8a80-dadabab80104","title_url":"https://workshop.closeclaw.top/ai/title/%E6%95%B0%E5%AD%97%E5%8C%96%E7%94%9F%E5%AD%98%2020%E5%91%A8%E5%B9%B4%E7%BA%AA%E5%BF%B5%E7%89%88","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/bbcce9bd-b637-4fa6-8a80-dadabab80104/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/bbcce9bd-b637-4fa6-8a80-dadabab80104/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/bbcce9bd-b637-4fa6-8a80-dadabab80104","page_url":"https://workshop.closeclaw.top/api/ai/books/bbcce9bd-b637-4fa6-8a80-dadabab80104/page","search_url":"https://workshop.closeclaw.top/api/ai/books/bbcce9bd-b637-4fa6-8a80-dadabab80104/search"},"page":{"printed_page":107,"pdf_page":178,"physical_index":178,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"18a4e9428fb62f7b36bb40d6119bdf00dcf275ac332c912058b4b4480362121f"},"chapter":"20周年纪念版 数字化生存 一本影响千百万人的互联网启蒙经典著作","content":"欧洲的电视业者以所谓的“上下加框”（letterboxing）的办法来解决荧幕高宽比的差异问题。他们把荧幕的上下两边都用黑框盖住，因此留下来的放映区域正好符合电影银幕的高宽比。通过牺牲一些像素，观众得以看到忠实地重现出原本的画面形状的影片。事实上，我认为“上下加框”的效果十分令人满意，而且这样做还有一个额外的优点：它在影像上下各自放置了一道鲜明的水平黑边，从而取代了电视机原本的弧形塑料边；否则的话，影像的界限就不会那么明确。\n\n我们在美国则很少这么做。当我们要把电影转换成录像带时，采用的是“摇摄及扫描”（panandscan）的做法，把宽银幕电影压缩为3:4的长方形。我们不是真的把影像压扁(尽管我们有时会压缩标题和工作人员名单字幕)。相反地，在转换过程中，当影片在机器中转动时（机器通常是一台飞点扫描器[12])，操作员会以手控方式，把一个高宽比为3:4的窗口套在宽得多的电影画面上，接着上下左右调整移动该窗门，来捕捉每一幅电影画面中最直接相关的内容。\n\nPart 2| 个性化界面\n\n107\n\n[7]由3台连接在一起的摄影机在3条35毫米的胶片上分别摄取宽画面的1/3，用3台同步运转的放映机将3条影片同时投映于宽阔的弧形银幕上。合成整幅画面，并配用多路立体声还音装置。\n\n[8] [9] [10] 均为银幕电影的工艺。\n\n[11]摄影时加装变形附加镜，使所摄影像沿水平方向压缩，在胶片上形成狭长的变形影像，放映时也加装放映变形附加镜，使变形影像恢复为正常影像，成为宽银幕画面。","previous_page":106,"next_page":108}