If you ever (MS Paint), you have come to realize that the final result value is much lower than the expected Windows provided by the equipment by using JPG, as a BMP file to save tried, that's why we have a third party to use the program to do it .
JPEG Express is a free tool in your hand, JPG, convert your files and is likely to enjoy excellent results.
You can output quality as well as the format (a JPEG or BMP) that way you will be sure that the quality you want you'll be able to adjust.
Parameter is expressed in a percentage, 0% and 100% of a bad picture is not very good.
If you want to convert your photos in a JPEG, JPEG Express may be a good choice.