把 Excel 里太大的图片 (文件大小) 通过降低分辨率和尺寸的方式减少尺寸. 所有的图片都会被缩减到 $IMGSIZE 以下.
ImageMagick
$ source comprezer.sh
$ IMGSIZE=1,000,000; comprezer demo.xlsx output.xlsx
all image files inside demo.xlsx will be compressed so its filesize less than 1000000 bytes
processing xl/media/image3.jpeg... ...done (image reduced by 537606 bytes = 1358165 - 820559)
reduced
/Users/zxtang/git/compress-excel-images/demo.xlsx ( 2106274 bytes) to
output.xlsx ( 1543716 bytes) by 562558 bytes$ IMGSIZE=1,000,000; comprezer demo.xlsx demo-level-1.xlsx
all image files inside demo.xlsx will be compressed so its filesize less than 1000000 bytes
processing xl/media/image3.jpeg... ...done (image reduced by 537606 bytes = 1358165 - 820559)
reduced
/Users/zxtang/git/compress-excel-images/demo.xlsx ( 2106274 bytes) to
demo-level-1.xlsx ( 1543716 bytes) by 562558 bytes
$ IMGSIZE=500,000; comprezer demo.xlsx demo-level-2.xlsx
all image files inside demo.xlsx will be compressed so its filesize less than 500000 bytes
processing xl/media/image1.jpg...done (image reduced by 59071 bytes = 522272 - 463201)
processing xl/media/image3.jpeg... ... ... ...done (image reduced by 987490 bytes = 1358165 - 370675)
reduced
/Users/zxtang/git/compress-excel-images/demo.xlsx ( 2106274 bytes) to
demo-level-2.xlsx ( 1050049 bytes) by 1056225 bytes
$ IMGSIZE=100,000; comprezer demo.xlsx demo-level-3.xlsx
all image files inside demo.xlsx will be compressed so its filesize less than 100000 bytes
processing xl/media/image1.jpg... ... ... ... ...done (image reduced by 427380 bytes = 522272 - 94892)
processing xl/media/image2.jpg... ... ...done (image reduced by 105679 bytes = 182137 - 76458)
processing xl/media/image3.jpeg... ... ... ... ... ... ... ...done (image reduced by 1285978 bytes = 1358165 - 72187)
reduced
/Users/zxtang/git/compress-excel-images/demo.xlsx ( 2106274 bytes) to
demo-level-3.xlsx ( 285091 bytes) by 1821183 bytes
$ IMGSIZE=10,000; comprezer demo.xlsx demo-level-4.xlsx
all image files inside demo.xlsx will be compressed so its filesize less than 10000 bytes
processing xl/media/image1.jpg... ... ... ... ... ... ... ... ... ... ...done (image reduced by 513327 bytes = 522272 - 8945)
processing xl/media/image2.jpg... ... ... ... ... ... ... ... ...done (image reduced by 174442 bytes = 182137 - 7695)
processing xl/media/image3.jpeg... ... ... ... ... ... ... ... ... ... ... ... ... ...done (image reduced by 1351017 bytes = 1358165 - 7148)
reduced
/Users/zxtang/git/compress-excel-images/demo.xlsx ( 2106274 bytes) to
demo-level-4.xlsx ( 65857 bytes) by 2040417 bytes
$ ls -alh
total 19672
drwxr-xr-x@ 19 zxtang staff 608B Mar 29 10:49 .
drwxr-xr-x@ 131 zxtang staff 4.1K Mar 28 18:05 ..
-rw-r--r--@ 1 zxtang staff 2.0M Mar 28 18:21 demo.xlsx
-rw-r--r--@ 1 zxtang staff 1.5M Mar 29 10:45 demo-level-1.xlsx
-rw-r--r--@ 1 zxtang staff 1.0M Mar 29 10:46 demo-level-2.xlsx
-rw-r--r--@ 1 zxtang staff 278K Mar 29 10:46 demo-level-3.xlsx
-rw-r--r--@ 1 zxtang staff 64K Mar 29 10:48 demo-level-4.xlsx
