我想把`tex lion`当背景，在[https://www.ctan.org/lion/files](https://www.ctan.org/lion/files)里找到了`ctanlion_ep...
我想把`tex lion`当背景，在[https://www.ctan.org/lion/files](https://www.ctan.org/lion/files)里找到了`ctanlion_eps`矢量图，我用命令行`for %f in (*.eps) do epstopdf "%f" "%~nf.pdf"`将`eps`文件转化为`pdf`文件，用`wallpaper`宏包将背景插入到文档中后，发现小狮子线条的颜色太重了，如何设置才能使背景变淡、透明(或者如何调整图片原本线条的颜色)，让文字易于识别
MWE
```tex
\documentclass{ctexart}
\usepackage{wallpaper}
\CenterWallPaper{1}{ctanlion.pdf}
\usepackage{zhlipsum}
\begin{document}
\zhlipsum[1-2]
\end{document}
```
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://wenda.latexstudio.net/data/attach/logo/logo.png', '推荐 sikouhjw 的问题《如何使插入背景的图片颜色变淡？》','https://wenda.latexstudio.net/answer/1343/1873.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
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