转换 pdf 为 png 图片
bigclean
posted @ 2010年6月02日 23:21
in software
, 2685 阅读
写作论文时，时时需要画流程图。原来有用 pgf 画流程图，很方便而且生 成的 pdf 插入 tex 也很方便。但是论文必须要用邪恶的 word 排版，智能用 imagemagick 中的 convert 将 pdf 转换成 png 格式，但是转换后的图片很 模糊，插入 word 之中根本无法入眼，很影响文档的美观，遂只能作罢。后来换用 了 edraw，倒还凑合，但总是感觉不是太满意。
最近，阅读了 LiYanrui 的文档，才发觉是 convert 的参数设置问 题导致输出的图片模糊。
convert 命令有许多选项参数，本文用到的选项如下：
- -trim：裁剪图像四周空白区域；
- -transparent color：去除图像中指定的颜色；
- -density geometry：设定图像的 DPI 值，通常为 96；
- -antialias：让图像具有抗锯齿的效果；
- -quality：图像压缩等级。
然后用如下的 convert 命令对 pdf 文件转换:
convert -quality 100 -antialias -density 96 -transparent white -trim test.pdf test.png
转换输出后的 png 图片非常好，插入 word 也很好了。
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