How do you change compression ratio for jpeg files?

I need to provide picture files that are 300 dpi, (no problem) and saved at a 10 to 12 compression rate. I can not find out what rate my files are now and how to change it if need be. I have checked the properties of the files and no info is there regarding this. Hope someone can help! I have looked up many sites explaining what compression ratios are and the scientific blah blah blah, but nothing on how to just check it and change it.



Thanks!How do you change compression ratio for jpeg files?
There is actually no universal standard for jpeg compression. Your printer is most likely referring to Photoshop quality ratings, which range from 1 to 12. Other programs use a 1 to 100 scale. In most image processing software, selecting ';save as'; brings up a dialog box that includes a choice of picture quality. Unless you have a serious problem with the resulting file size, just choose the highest quality setting.