{"id":481,"date":"2009-10-05T01:24:50","date_gmt":"2009-10-04T17:24:50","guid":{"rendered":"http:\/\/www.fredkuo.idv.tw\/wordpress\/?p=481"},"modified":"2009-10-21T15:39:36","modified_gmt":"2009-10-21T07:39:36","slug":"%e7%82%ba%e4%bb%80%e9%ba%bc%e6%98%af300dpippi","status":"publish","type":"post","link":"https:\/\/fredkuo.idv.tw\/wordpress\/?p=481","title":{"rendered":"\u70ba\u4ec0\u9ebc\u662f300dpi(ppi)"},"content":{"rendered":"

\u4e00\u76f4\u4ee5\u4f86\uff0c\u5370\u5237\u5ee0\u6216\u8f38\u51fa\u4e2d\u5fc3\u90fd\u6703\u8981\u5ba2\u6236\u63d0\u4f9b300 dpi\u7684\u5716\u6a94\uff0c\u4f46\u70ba\u4ec0\u9ebc\u662f300dpi\uff0c200dpi\u53ef\u4e0d\u53ef\u4ee5\uff1f\u4e00\u65b9\u9762\u5c31\u7d93\u9a57\u503c\uff0c300dpi\u662f\u6c92\u6709\u554f\u984c\u7684\uff1b\u4f46\u6709\u6c92\u6709\u7269\u7406\u4e0a\u7684\u6216\u6578\u5b78\u4e0a\u7684\u89e3\u91cb\u4f86\u652f\u6301300dpi\u9019\u500b\u6578\u5b57\uff1f<\/p>\n

\u6211\u4e5f\u4e0d\u80fd\u5b8c\u5168\u78ba\u5b9a\u4ee5\u4e0b\u7684\u89e3\u91cb\u662f\u4e0d\u662f\u6700\u6b63\u78ba\u7684\u8b1b\u6cd5\uff0c\u4f46\u81f3\u5c11\u5728\u908f\u8f2f\u4e0a\u6211\u8a8d\u70ba\u662f\u6210\u7acb\u7684\u3002<\/p>\n

\"acuity\"<\/a><\/p>\n

<\/p>\n

\u7576\u8ac7\u5230\u8272\u5f69\u79d1\u5b78\u7684\u6642\u5019\uff0c\u5fc5\u9808\u5f9e\u4eba\u7684\u773c\u775b\u958b\u59cb\u8ac7\u8d77\uff1b\u5728\u4e00\u500b\u4ee5\u4eba\u70ba\u6587\u660e\u4e3b\u9ad4\u7684\u79d1\u5b78\u6d3b\u52d5\uff0c\u6211\u5011\u53ea\u8a08\u7b97380nm\u5230700nm\u4e4b\u9593\u4eba\u773c\u53ef\u67e5\u89ba\u5f97\u5230\u7684\u5149\u8b5c\u5206\u5e03\u7bc4\u570d\u4f86\u505a\u70ba\u8272\u5f69\u5b78\u7684\u8a08\u7b97\uff1b\u540c\u6a23\u7684\uff0c\u5728\u89e3\u91cb\u5f71\u50cf\u8cc7\u6599\u91cf\u7684\u9700\u6c42\u6642\u4e5f\u662f\u5fc5\u9808\u5f9e\u4eba\u7684\u773c\u775b\u8ac7\u8d77\uff08\u4e5f\u5c31\u662f\u8aaa\uff0c\u5982\u679c\u4eca\u5929\u4f60\u5716\u50cf\u7684\u5ba2\u6236\u6709\u8001\u9df9\u4e00\u822c\u7570\u65bc\u5e38\u4eba\u7684\u8996\u529b\u7684\u8a71\uff0c300dpi\u7684\u5716\u50cf\u8cc7\u6599\u6709\u53ef\u80fd\u662f\u4e0d\u5920\u7684\uff09\u3002<\/p>\n

\u5c31\u6211\u80fd\u63a8\u8ad6\u5f97\u5230\u7684\u8cc7\u6599\u88e1\uff0c\u4eba\u773c\u7684\u8fa8\u8b58\u80fd\u529b(\u0398)\u662f1\/60\u5ea6(\u898b\u4e0a\u5716)\uff0c\u4eba\u773c\u8fa8\u8b58\u6240\u9700\u7684\u8cc7\u6599\u91cf\u8207\u89c0\u770b\u8ddd\u96e2(d)\u76f8\u95dc\uff0c \u4e00\u822c\u95b1\u8b80\u7684\u8ddd\u96e2\u7d0412 inch (or 30cm, \u624b\u8098\u6301\u7269\u5fae\u5f4e\u8207\u773c\u775b\u7684\u8ddd\u96e2)\uff0c\u5982\u6b64\u4e00\u4f86\uff1a<\/p>\n

X\/2 = d (tan \u00d8\/2), \u00d8 = 1\/60 degree, d = \u89c0\u770b\u8ddd\u96e2, X = \u8fa8\u8b58\u6975\u9650<\/p>\n

d = 12 inch, \u00d8 = 1\/60 degree, X = 0.00349 inch
\nppi needed: 1\/0.00349 inch = 286 ppi<\/p>\n

\u7cbe\u78ba\u7684\u6578\u5b57\u61c9\u8a72\u662f286dpi(ppi).<\/p>\n

\u4ee5300dpi\u4f86\u505a\u70ba human application \u7684\u9700\u6c42\u662f\u5408\u7406\u7684\u3002<\/p>\n

\u8b93\u6211\u5011\u4f86\u8ddf\u6578\u4f4d\u76f8\u6a5f\u7684\u756b\u7d20\u8207\u8f38\u51fa\u5c3a\u5bf8\u505a\u4e00\u4e0b\u95dc\u9023\uff1a<\/p>\n

\u4ee54×6\u76f8\u7d19\u8f38\u51fa\uff1a 4x300dpi<\/span> x 6x300dpi<\/span>= 2160000 \u7d04200\u767e\u842c\u756b\u7d20<\/p>\n

\u4ee58×10\u76f8\u7d19\u8f38\u51fa\uff1a 8x300dpi <\/span>x 10x300dpi<\/span>= 7200000 \u7d04700\u767e\u842c\u756b\u7d20<\/p>\n

\u9019\u5e74\u982d\u6578\u4f4d\u76f8\u6a5f\u52d5\u4e0d\u52d5\u5c31\u4e0a\u5343\u842c\u756b\u7d20\uff0c\u652f\u63f4A4\u7684\u8f38\u51fa\u54c1\u61c9\u8a72\u90fd\u4e0d\u6210\u554f\u984c\u4e86\u3002<\/p>\n

\u518d\u4f9d\u4ee5\u4e0a\u908f\u8f2f\uff0c\u5982\u679c\u89c0\u770b\u8ddd\u96e2\u5927\u65bc30cm(\u5982\u6236\u5916\u6d77\u5831)\uff0c\u5716\u50cf\u8cc7\u6599\u7684\u9700\u6c42\u662f\u7528\u4e0d\u5230300dpi\u7684\uff0c\u518d\u5982\u6578\u4f4d\u5178\u85cf\u7684\u53e4\u5730\u5716\u4e4b\u985e\uff0c\u6703\u7528\u653e\u5927\u93e1\u53bb\u9451\u8b58\u7684\uff0c1000dpi \u4e5f\u53ef\u80fd\u525b\u597d\u800c\u5df2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e00\u76f4\u4ee5\u4f86\uff0c\u5370\u5237\u5ee0\u6216\u8f38\u51fa\u4e2d\u5fc3\u90fd\u6703\u8981\u5ba2\u6236\u63d0\u4f9b300 dpi\u7684\u5716\u6a94\uff0c\u4f46\u70ba\u4ec0\u9ebc\u662f300dpi\uff0c200dpi\u53ef\u4e0d\u53ef\u4ee5\uff1f\u4e00 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[24,32,102,25,23,21],"class_list":["post-481","post","type-post","status-publish","format-standard","hentry","category-4","tag-24","tag-digital-archive","tag-102","tag-25","tag-23","tag-21"],"_links":{"self":[{"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/481"}],"collection":[{"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=481"}],"version-history":[{"count":5,"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/481\/revisions"}],"predecessor-version":[{"id":486,"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/481\/revisions\/486"}],"wp:attachment":[{"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fredkuo.idv.tw\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}