How to deal with too small picture downloaded from xuexin.com

An inch of electronic photos are not saved in Baidu cloud , Comparison error . Just want to find one from Xuexin . But the pictures downloaded from xuexin.com are relatively small . The solution is to use this http://waifu2x.udp.jp/ Website , Upload the picture and deal with it , Then the picture gets bigger , Basically meet the requirements .

Reference resources ：

https://zhuanlan.zhihu.com/p/90759425