用acrobat export 导出就行了，不过如果原材料已经是pdf那就没办法了。
黑白版本
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弄好了，上传了。
太棒了！体积缩小了 
非常感谢！
话说，在kindle上看这本英汉辞海真的是赏心悦目。九宫格分割后跟设备非常适配。迎面而来的，是上个世纪那种铅字排印的质感 
优雅！太优雅了！给人感觉即使是大部头，也有通读的欲望。
另，原来2G大小的pdf，kindle和国产电纸书（博阅）都带不动了，我是按字母分割了才能打开。（越狱后的kindle Oasis，KO reader可以分3栏，而KPW2的多看系统只能分2栏）
Kindle Oasis看英汉辞海，翻页略有迟缓，但是可以接受；而KPW2翻页就太慢了 
谢谢欣赏好资源，好东西就要好好分享！
感谢M兄的优化制作！
目前的版本6052页分辨率是较低的，比较模糊。看到这个帖子里kadioguy兄提供了6052页的高清原图，可否考虑更新一下呢：
确实可以，多谢
Could anyone please repack this addition?
I’m afraid that the mdx owner would not repack for a single page. Still, you can just simply put the clear page in the mdx folder and rename it as YHCH_6052.png, then the dict software will prefer the clearer one you add.
I downloaded the two zip file from amob that contain the dictionary, i could only extract the first one which gave me mdx file. I assume the other zip file has mdd or maybe css aswell But I can’t extract that one…
Perhaps you shall download zip files and try one more time, make sure 2 zips are in the same folder and extract the first one, then 2 zips would be extracted as a whole.
更新了mdd还加了原高清彩色pdf（体积够大）喜欢纸质色泽和质感的可以browse
原来的#9楼百度链接我没法改动了，新的链接
链接: https://pan.baidu.com/s/1EURZhHUlcajC6s1cdQ84QA?pwd=ffia
改动文件：
英汉辞海 [高清非切图]-original.pdf 英汉辞海 [高清非切图]-bitonal.mdd
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多谢，辛苦了。
Wow thank you so much! Could anyone please add to another source for non Chinese mainland users?
Here:
PDF 20gb too large to fit.
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Thank you so much I really appreciate you for taking time to upload this! From my understanding, dictionary can be used without pdf file?
Try and find out. It is self-evident.
Okay. I only ask because of limited mobile data plan. Thank you again 