xaringan做幻灯片，当图片out.width超出范围后，图片无法打印到pdf。

wangbinzjcc

使用xaringan包做了幻灯片，html格式显示完好，然而，打印为pdf后，却发现有很多的图片无法显示。当时临近会议，惊得我一身冷汗，短时间内又无法解决。情急之下只好将网页版幻灯片截图下来，插入PDF版中。暂时化解危机。

今天，又反复测试了一下，发现了问题。当图片out.width超出范围后，html格式可以正常显示，但是转成pdf（Google Chrome打印）时图片无法显示。

知道这问题后下次就可避免，比如out.width设置不要太大。但是我想知道，有没有更好的方法或者建议呢？

xaringan测试代码如下：

---
title: "幻灯忍者"
subtitle: "写轮眼"
author: "xxx"
institute: "RStudio, PBC"
date: "2016/12/12"
output:
  xaringan::moon_reader:
    css: [default, zh-CN.css]
    lib_dir: libs
    nature:
      ratio: "16:9"
      highlightStyle: github
      highlightLines: true
      countIncrementalSlides: false
---
```{r include=FALSE}
jpeg("test.jpg", width = 1600, height = 900)
par(bg=grey(7/8))
plot(0:100)
dev.off()
```

测试90%
```{r echo=FALSE, out.width = "90%"}
knitr::include_graphics("test.jpg")
```

---
测试92%
```{r echo=FALSE, out.width = "92%"}
knitr::include_graphics("test.jpg")
```

---
测试96%
```{r echo=FALSE, out.width = "96%"}
knitr::include_graphics("test.jpg")
```

---
 测试100%
```{r echo=FALSE, out.width = "100%"}
knitr::include_graphics("test.jpg")
```

---
 测试49%+49%
```{r echo=FALSE, out.width = "49%"}
knitr::include_graphics("test.jpg")
```
```{r echo=FALSE, out.width = "49%"}
knitr::include_graphics("test.jpg")
```

---
测试50%+50%
```{r echo=FALSE, out.width = "50%"}
knitr::include_graphics("test.jpg")
```
```{r echo=FALSE, out.width = "50%"}
knitr::include_graphics("test.jpg")
```

我的运行环境如下：


> sessionInfo()
R version 4.2.1 (2022-06-23 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19044)

Matrix products: default

locale:
[1] LC_COLLATE=Chinese (Simplified)_China.utf8 
[2] LC_CTYPE=C                                 
[3] LC_MONETARY=Chinese (Simplified)_China.utf8
[4] LC_NUMERIC=C                               
[5] LC_TIME=Chinese (Simplified)_China.utf8    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.8.3      compiler_4.2.1    later_1.3.0       remotes_2.4.2    
 [5] tools_4.2.1       digest_0.6.29     jsonlite_1.8.0    evaluate_0.15    
 [9] lifecycle_1.0.1   viridisLite_0.4.0 rlang_1.0.2       cli_3.3.0        
[13] rstudioapi_0.13   yaml_2.3.5        pagedown_0.18     xfun_0.31        
[17] fastmap_1.1.0     kableExtra_1.3.4  httr_1.4.3        stringr_1.4.0    
[21] xml2_1.3.3        knitr_1.39        htmlwidgets_1.5.4 systemfonts_1.0.4
[25] websocket_1.4.1   DT_0.24           webshot_0.5.3     svglite_2.1.0    
[29] glue_1.6.2        R6_2.5.1          processx_3.5.3    rmarkdown_2.14   
[33] xaringan_0.26     magrittr_2.0.3    servr_0.24        ps_1.7.0         
[37] scales_1.2.0      promises_1.2.0.1  htmltools_0.5.2   rvest_1.0.2      
[41] mime_0.12         colorspace_2.0-3  httpuv_1.6.5      stringi_1.7.6    
[45] munsell_0.5.0