{"id":180215,"date":"2024-05-08T20:30:44","date_gmt":"2024-05-08T12:30:44","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/180215.html"},"modified":"2024-05-08T20:30:50","modified_gmt":"2024-05-08T12:30:50","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8r%e8%af%ad%e8%a8%80%e8%be%93%e5%87%ba%e9%ab%98dpi%e5%9b%be%e7%89%87","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/180215.html","title":{"rendered":"\u5982\u4f55\u4f7f\u7528R\u8bed\u8a00\u8f93\u51fa\u9ad8dpi\u56fe\u7247"},"content":{"rendered":"

\"\u5982\u4f55\u4f7f\u7528R\u8bed\u8a00\u8f93\u51fa\u9ad8dpi\u56fe\u7247\"<\/p>\n

\u4f7f\u7528R\u8bed\u8a00\u8f93\u51fa\u9ad8dpi\uff08\u70b9\u6bcf\u82f1\u5bf8\uff09\u56fe\u7247\u662f\u4e3a\u4e86\u4fdd\u8bc1\u5728\u5370\u5237\u6216\u662f\u5c4f\u5e55\u5c55\u793a\u4e2d\u5f97\u5230\u6e05\u6670\u7684\u56fe\u50cf\u3002\u9ad8dpi\u56fe\u7247\u610f\u5473\u7740\u5728\u5355\u4f4d\u9762\u79ef\u5185\u5305\u542b\u66f4\u591a\u7684\u50cf\u7d20\u70b9\uff0c\u4ece\u800c\u63d0\u5347\u56fe\u7247\u7684\u7ec6\u8282\u8868\u73b0\u529b\u3001\u51cf\u5c11\u50cf\u7d20\u5316\u7684\u73b0\u8c61\uff0c\u4ee5\u53ca\u6539\u8fdb\u56fe\u50cf\u7684\u6574\u4f53\u8d28\u91cf<\/strong>\u3002\u5728R\u8bed\u8a00\u4e2d\uff0c\u8fd9\u901a\u5e38\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u56fe\u5f62\u8bbe\u5907\u7684\u5206\u8fa8\u7387\u53c2\u6570\u6765\u5b9e\u73b0\uff0c\u5982ggsave<\/code>\u51fd\u6570\u4e2d\u7684dpi<\/code>\u53c2\u6570\u3001\u6216\u662f\u5728\u4f7f\u7528png()<\/code>,jpeg()<\/code>\u7b49\u51fd\u6570\u65f6\u6307\u5b9ares<\/code>\u53c2\u6570\u3002\u63a5\u4e0b\u6765\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5229\u7528\u8fd9\u4e00\u529f\u80fd\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528ggsave<\/code>\u51fd\u6570\u4fdd\u5b58\u9ad8dpi\u56fe\u7247<\/h3>\n<\/p>\n

ggsave<\/code>\u51fd\u6570\u662fggplot2<\/code>\u5305\u4e2d\u63d0\u4f9b\u7684\u4e00\u4e2a\u975e\u5e38\u65b9\u4fbf\u7684\u56fe\u50cf\u4fdd\u5b58\u51fd\u6570\uff0c\u5b83\u5141\u8bb8\u7528\u6237\u76f4\u63a5\u5c06ggplot\u521b\u5efa\u7684\u56fe\u5f62\u4fdd\u5b58\u4e3a\u6587\u4ef6\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6edpi<\/code>\u53c2\u6570\u6765\u63a7\u5236\u8f93\u51fa\u56fe\u7247\u7684\u5206\u8fa8\u7387\u3002<\/p>\n<\/p>\n

\u9996\u5148\uff0c\u4f60\u9700\u8981\u521b\u5efa\u4e00\u4e2aggplot\u5bf9\u8c61\u3002\u5047\u8bbe\u4f60\u5df2\u7ecf\u6709\u4e86\u4e00\u4e2a\u540d\u4e3ap<\/code>\u7684ggplot\u7ed8\u56fe\u5bf9\u8c61\uff0c\u63a5\u4e0b\u6765\u7684\u4efb\u52a1\u5c31\u662f\u5c06\u5b83\u4fdd\u5b58\u4e3a\u9ad8\u5206\u8fa8\u7387\u7684\u56fe\u7247\uff1a<\/p>\n<\/p>\n

ggsave("high_dpi_image.png", plot = p, dpi = 300)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06dpi<\/code>\u8bbe\u7f6e\u4e3a300\uff0c\u8fd9\u662f\u6253\u5370\u54c1\u8d28\u6240\u5e38\u7528\u7684\u5206\u8fa8\u7387\u3002\u8fd9\u4e2a\u53c2\u6570\u53ef\u4ee5\u6839\u636e\u4f60\u7684\u5177\u4f53\u9700\u6c42\u8fdb\u884c\u8c03\u6574\u3002<\/p>\n<\/p>\n
\u63a5\u7740\uff0c\u6211\u4eec\u4f1a\u6df1\u5165\u8ba8\u8bba\u5176\u4ed6\u5173\u4e8e\u8bbe\u5b9a\u9ad8dpi\u8f93\u51fa\u7684\u65b9\u6cd5\u548c\u6280\u5de7\uff0c\u4ee5\u53ca\u5982\u4f55\u5728\u4e0d\u540c\u60c5\u5883\u4e0b\u6700\u4f18\u5730\u5e94\u7528\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u56fe\u5f62\u8bbe\u5907\u51fd\u6570\u8f93\u51fa\u9ad8dpi\u56fe\u7247<\/h3>\n<\/p>\n
R\u8bed\u8a00\u63d0\u4f9b\u4e86\u591a\u4e2a\u56fe\u5f62\u8bbe\u5907\u51fd\u6570\uff0c\u5982png()<\/code>, jpeg()<\/code>, tiff()<\/code>\u7b49\uff0c\u901a\u8fc7\u8fd9\u4e9b\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u63a7\u5236\u8f93\u51fa\u56fe\u50cf\u7684dpi\u3002<\/p>\n<\/p>\n
\u4f7f\u7528png()<\/code>\u51fd\u6570<\/h4>\n<\/p>\n
png()<\/code>\u51fd\u6570\u5141\u8bb8\u4f60\u5c06\u56fe\u5f62\u8f93\u51fa\u4e3apng\u6587\u4ef6\uff0c\u540c\u65f6\u53ef\u4ee5\u901a\u8fc7res<\/code>\u53c2\u6570\u6765\u8bbe\u7f6e\u56fe\u7247\u7684\u5206\u8fa8\u7387\uff0c\u6bd4\u5982\uff1a<\/p>\n<\/p>\n
png("output.png", width = 800, height = 600, res = 300)<\/p>\n
plot(x, y) # \u4f60\u7684\u7ed8\u56fe\u4ee3\u7801<\/p>\n
dev.off()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d, width<\/code>\u548cheight<\/code>\u53c2\u6570\u8bbe\u7f6e\u4e86\u56fe\u50cf\u7684\u5c3a\u5bf8\uff0cres<\/code>\u8bbe\u7f6e\u4e86\u56fe\u7247\u7684\u5206\u8fa8\u7387\u4e3a300dpi\u3002dev.off()<\/code>\u7528\u4e8e\u5173\u95ed\u5f53\u524d\u7684\u56fe\u5f62\u8bbe\u5907\uff0c\u8fd9\u662f\u8f93\u51fa\u56fe\u5f62\u7684\u4e00\u4e2a\u5fc5\u8981\u6b65\u9aa4\u3002<\/p>\n<\/p>\n
\u4f7f\u7528jpeg()<\/code>\u51fd\u6570<\/h4>\n<\/p>\n
\u4e0epng()<\/code>\u7c7b\u4f3c\uff0cjpeg()<\/code>\u51fd\u6570\u4e5f\u63d0\u4f9b\u4e86res<\/code>\u53c2\u6570\u6765\u63a7\u5236\u8f93\u51fa\u7684\u56fe\u7247\u5206\u8fa8\u7387\uff1a<\/p>\n<\/p>\n
jpeg("output.jpg", width = 800, height = 600, res = 300)<\/p>\n
plot(x, y) # \u4f60\u7684\u7ed8\u56fe\u4ee3\u7801<\/p>\n
dev.off()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u65e0\u8bba\u662f\u54ea\u79cd\u56fe\u5f62\u8bbe\u5907\u51fd\u6570\uff0c\u90fd\u80fd\u591f\u5b9e\u73b0\u9ad8dpi\u56fe\u50cf\u7684\u8f93\u51fa\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u8c03\u6574\u56fe\u50cf\u5c3a\u5bf8\u4e0edpi\u7684\u5173\u7cfb<\/h3>\n<\/p>\n
\u7406\u89e3\u56fe\u50cf\u5c3a\u5bf8\u4e0edpi\u4e4b\u95f4\u7684\u5173\u7cfb\u5bf9\u4e8e\u8f93\u51fa\u9ad8\u8d28\u91cf\u7684\u56fe\u7247\u5341\u5206\u91cd\u8981\u3002\u9ad8dpi\u7684\u8bbe\u7f6e\u4f1a\u589e\u52a0\u56fe\u50cf\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u4f46\u540c\u65f6\u4e5f\u80fd\u5927\u5e45\u63d0\u5347\u56fe\u7247\u7684\u6e05\u6670\u5ea6\u548c\u7ec6\u8282\u8868\u73b0\u529b<\/strong>\u3002\u5f53\u8c03\u6574width<\/code>\u3001height<\/code>\u548cres<\/code>\u53c2\u6570\u65f6\uff0c\u9700\u8981\u8003\u8651\u6700\u7ec8\u8f93\u51fa\u56fe\u7247\u7684\u7528\u9014\uff0c\u6bd4\u5982\u7f51\u9875\u5c55\u793a\u3001\u5b66\u672f\u51fa\u7248\u6216\u662f\u5370\u5237\u54c1\u8d28\u3002<\/p>\n<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5b9e\u7528\u7684\u5efa\u8bae\uff1a<\/p>\n<\/p>\n